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 <img src="http://file.open.com.cn/itemdb/dbdx/lisanshuxue/test/12257793747341.bmp"></img>
A:<img alt="" src="http://file.open.com.cn/itemdb/dbdx/lisanshuxue/test/12257794101562.bmp"></img>
B:<img alt="" src="http://file.open.com.cn/itemdb/dbdx/lisanshuxue/test/12257794423593.bmp"></img>
C:<img alt="" src="http://file.open.com.cn/itemdb/dbdx/lisanshuxue/test/12257794637964.bmp"></img>
D:<img alt="" src="http://file.open.com.cn/itemdb/dbdx/lisanshuxue/test/12257794850315.bmp"></img>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">单选题。一棵根树是完全</span><span lang="EN-US"><font face="Times New Roman">m</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">叉树,当且仅当</span><font face="Times New Roman"> </font><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">该图(</span><span lang="EN-US"><span style="mso-spacerun: yes"><font face="Times New Roman"> </font></span></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">)。</span></font></p>
A:<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">每个结点的度数是</span><span lang="EN-US"><font face="Times New Roman">m</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">;</span><span lang="EN-US"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span></font></span></font></p>
B:<font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">每个结点的出度都是</span><span lang="EN-US"><font face="Times New Roman">m</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">;</span></font>
C:<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">每个结点的出度不是</span><span lang="EN-US"><font face="Times New Roman">0</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">就是</span><span lang="EN-US"><font face="Times New Roman">m</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">;</span><span lang="EN-US"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span></font></span></font></p>
D:<font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">恰有一个结点入度为</span><span lang="EN-US"><font face="Times New Roman">0</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">:其余结点入度为</span><span lang="EN-US"><font face="Times New Roman">1</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</span></font>
<img alt="" src="http://file.open.com.cn/itemdb/dbdx/lisanshuxue/test/12253261108121.bmp"></img>
A:B:①:⑵⑶⑺⑻
B:B:②:⑶⑷⑻
C:B:③:⑶⑹⑺⑻
D:B:④:⑶⑺
<span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">单选题。结点是树的叶结点,当且仅当</span><font face="Times New Roman"> </font><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">该结点(</span><span lang="EN-US"><span style="mso-spacerun: yes"><font face="Times New Roman"> </font></span></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">)。</span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"> </p></span>
A:<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">度数不为</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: "Times New Roman"; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">0</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">;</span></span></font></p>
B:<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">度数大于</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">1</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">;</span>
C:<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">度是等于</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">1</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">。</span>
<img alt="" src="http://file.open.com.cn/itemdb/dbdx/lisanshuxue/test/12253392820811.bmp"></img>
A:<img alt="" src="http://file.open.com.cn/itemdb/dbdx/lisanshuxue/test/12253393099402.bmp"></img>
B:<img alt="" src="http://file.open.com.cn/itemdb/dbdx/lisanshuxue/test/12253393240813.bmp"></img>
C:<img alt="" src="http://file.open.com.cn/itemdb/dbdx/lisanshuxue/test/12253393403154.bmp"></img>
D:<img alt="" src="http://file.open.com.cn/itemdb/dbdx/lisanshuxue/test/12253393542845.bmp"></img>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; mso-outline-level: 1"><font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt; mso-bidi-font-weight: bold">令命题</span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt; mso-bidi-font-weight: bold"><font face="Times New Roman">P</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt; mso-bidi-font-weight: bold">表示“没有大学生不懂外语。” <font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt; mso-bidi-font-weight: bold">下面<span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt; mso-bidi-font-weight: bold">命题</span></span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt; mso-bidi-font-weight: bold"><font face="Times New Roman">(<span style="mso-spacerun: yes"> </span>)</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt; mso-bidi-font-weight: bold">与</span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt; mso-bidi-font-weight: bold"><font face="Times New Roman">P</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt; mso-bidi-font-weight: bold">等价。</span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt; mso-bidi-font-weight: bold"><o:p></o:p></span></font></span></font></p>
A:<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt; mso-outline-level: 1"><font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt; mso-bidi-font-weight: bold">有些大学生懂一些外语。</span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt; mso-bidi-font-weight: bold"><o:p></o:p></span></font></p>
B:<font size="3"><font face="宋体"> 所有大学生都懂一些外语。<span lang="EN-US" style="mso-bidi-font-size: 10.5pt; mso-bidi-font-weight: bold"><o:p></o:p></span></font></font>
C:<font face="宋体" size="3"> 有些大学生懂所有外语。</font>
D:<font face="宋体" size="3"> 没有大学生懂所有外语。</font>
<img alt="" src="http://file.open.com.cn/itemdb/dbdx/lisanshuxue/test/12257662070001.bmp"></img>
A:<img alt="" src="http://file.open.com.cn/itemdb/dbdx/lisanshuxue/test/12257662257182.bmp"></img>
B:<img alt="" src="http://file.open.com.cn/itemdb/dbdx/lisanshuxue/test/12257662635783.bmp"></img>
C:<img alt="" src="http://file.open.com.cn/itemdb/dbdx/lisanshuxue/test/12257663253904.bmp"></img>
D:<img alt="" src="http://file.open.com.cn/itemdb/dbdx/lisanshuxue/test/12257663473905.bmp"></img>
<img alt="" src="http://file.open.com.cn/itemdb/dbdx/lisanshuxue/test/12257665293281.bmp"></img>
A:自然数集合
B:整数集合
C:有理数集合
D:实数集合
<img alt="" src="http://file.open.com.cn/itemdb/dbdx/lisanshuxue/test/12252476675311.bmp"></img>
A:矛盾式
B:重言式
C:无法确定
D:不知道
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">选择填空题。</span><span lang="EN-US"><font face="Times New Roman">R</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是</span><span lang="EN-US"><font face="Times New Roman">A</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">上关系,如果</span><span lang="EN-US"><font face="Times New Roman">R</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是自反的,当且仅当</span><font face="Times New Roman"> </font><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">(</span><span lang="EN-US"><span style="mso-spacerun: yes"><font face="Times New Roman"> </font></span></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">)。</span></font></p>
A:<p><font size="3"><span lang="EN-US"><font face="Times New Roman">A</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中有些元素</span><span lang="EN-US"><font face="Times New Roman">x</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">,有</span><span lang="EN-US"><font face="Times New Roman"><x,x></font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">∈</span><font face="Times New Roman"><span lang="EN-US" style="mso-bidi-font-size: 10.5pt">R</span><span lang="EN-US"> </span></font><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">;</span></font><font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"></span></font></p>
B:<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 68.25pt; mso-char-indent-count: 6.5"><font size="3"><font face="Times New Roman"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所有</span><span lang="EN-US"><font face="Times New Roman">A</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中元素</span><span lang="EN-US"><font face="Times New Roman">x</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">,都有</span><span lang="EN-US"><font face="Times New Roman"><x,x></font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">∈</span><font face="Times New Roman"><span lang="EN-US" style="mso-bidi-font-size: 10.5pt">R</span><span lang="EN-US"> </span></font><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">;</span> <span lang="EN-US"><span style="mso-spacerun: yes"> </span></span></font></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 68.25pt; mso-char-indent-count: 6.5"><font size="3"><span lang="EN-US"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span></font></span></font></p>
C:<font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所有</span><span lang="EN-US"><font face="Times New Roman">A</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中元素</span><span lang="EN-US"><font face="Times New Roman">x,y</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">,如果有</span><span lang="EN-US"><font face="Times New Roman"><x,y></font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">∈</span><font face="Times New Roman"><span lang="EN-US" style="mso-bidi-font-size: 10.5pt">R</span><span lang="EN-US"> </span></font><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">,也有</span><span lang="EN-US"><font face="Times New Roman">< y, x ></font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">∈</span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt"><font face="Times New Roman">R</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">;则</span><span lang="EN-US"><font face="Times New Roman">x=y </font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</span></font>
设A={Φ},B=P(P(A))。判断下面命题的真值。<img alt="" src="http://file.open.com.cn/itemdb/dbdx/lisanshuxue/test/123069023946811.bmp" />
A:错误
B:正确
设A={Φ},B=P(P(A))。判断下面命题的真值。<img alt="" src="http://file.open.com.cn/itemdb/dbdx/lisanshuxue/test/123069042104612.bmp" />
A:错误
B:正确
R是A上关系,判断下面命题的真值。<img alt="" src="http://file.open.com.cn/itemdb/dbdx/lisanshuxue/test/123069185339013.bmp" />
A:错误
B:正确
判断下面命题的真值。<img alt="" src="http://file.open.com.cn/itemdb/dbdx/lisanshuxue/test/123068960454614.bmp" />
A:错误
B:正确
判断下面命题的正误“不是所有完全图Kn都是欧拉图,但是所有完全图Kn都是汉密尔顿图。”
A:错误
B:正确
下面的命题公式中哪些是永真式,只写出题号即可<img alt="" src="http://file.open.com.cn/itemdb/dbdx/lisanshuxue/test/123062290326512.bmp"></img>
A:1
B:2
C:3
D:4
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">多选填空题。</span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">给定集合</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><font face="Times New Roman">A={1,2,3}</font></span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">,定义</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><font face="Times New Roman">A</font></span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">上的等价关系如下:</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span></font></p><p style="TEXT-INDENT: 24pt; MARGIN: 0cm 0cm 0pt; mso-outline-level: 1" class="MsoNormal"><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><font size="3"><font face="Times New Roman">S={<1,1>,<1,2>,<2,1>,<2,2>,<3,3>}<o:p></o:p></font></font></span></p><p style="TEXT-INDENT: 15.75pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.5" class="MsoNormal"><font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">等价关系</span><span lang="EN-US"><font face="Times New Roman">S</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中含有等价类</span><span lang="EN-US"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>(<span style="mso-spacerun: yes"> </span>)</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</span></font></p>
A:<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><font size="3"><span lang="EN-US"><font face="Times New Roman">{1}</font></span><span lang="EN-US"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span></font></span></font></p>
B:<font size="3"><span lang="EN-US"><font face="Times New Roman">{2}</font></span><span lang="EN-US"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span></font></span></font>
C:<font size="3"><span lang="EN-US"><font face="Times New Roman">{3}</font></span></font>
D:<font size="3"><span lang="EN-US"><font face="Times New Roman">{1,2}</font></span></font>
E:<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><font size="3"><span lang="EN-US"><font face="Times New Roman">{1,3}</font></span><span lang="EN-US"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span></font></span></font></p>
F:<font size="3"><font face="Times New Roman"> </font><span lang="EN-US"><font face="Times New Roman">{2,3}</font></span><span lang="EN-US"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span></font></span></font>
G:<font size="3"><font face="Times New Roman"> {</font><span lang="EN-US"><font face="Times New Roman">1,2,3}</font></span></font>
<p>试题见图片<img height="384" width="512" alt="" src="http://file.open.com.cn/ItemDB/43594/aa0897be-b269-47c2-8596-f7af09723b49/20091010204014761.JPG" /></p>
A:A图
B:B图
C:C图
<img alt="" src="http://file.open.com.cn/itemdb/dbdx/lisanshuxue/test/123062356992111.bmp"></img>
A:A:⑴⑵⑶
B:B:⑴⑵⑷
C:C:⑵⑶⑷
D:D:⑴⑵⑶⑷
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><font size="3"><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-weight: bold">多选题。</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-weight: bold">令</span><span lang="EN-US" style="mso-bidi-font-weight: bold"><font face="Times New Roman">I</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-weight: bold">是整数集合;</span><span lang="EN-US" style="mso-bidi-font-weight: bold"><font face="Times New Roman">N</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-weight: bold">是自然数集合,</span><span lang="EN-US" style="mso-bidi-font-weight: bold"><font face="Times New Roman">R</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-weight: bold">是实数集合。+是加法运算,×是乘法运算。</span><span lang="EN-US" style="mso-bidi-font-weight: bold"><o:p></o:p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-weight: bold">下面所列代数系统哪些是半群?</span></font></p>
A:<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><font size="3"><span style="FONT-FAMILY: 宋体; mso-bidi-font-weight: bold"><span lang="EN-US"><I,+>,<span style="mso-spacerun: yes"> </span></span></span></font></p>
B:<font size="3"><font face="宋体"><span lang="EN-US"><R,+>,<span style="mso-spacerun: yes"> </span><span style="mso-spacerun: yes"> </span></span></font></font>
C:<font size="3"><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-bidi-font-weight: bold"><I,</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-weight: bold">×</span><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-bidi-font-weight: bold">>,<span style="mso-spacerun: yes"> </span></span></font>
D:<font size="3"><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-bidi-font-weight: bold"><N,</span><span style="FONT-FAMILY: 宋体; mso-bidi-font-weight: bold">×<span lang="EN-US">>,</span></span><span lang="EN-US" style="mso-bidi-font-weight: bold"><font face="Times New Roman"> </font></span></font>
E:<font size="3"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span></font><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-bidi-font-weight: bold"><R,</span><span style="FONT-FAMILY: 宋体; mso-bidi-font-weight: bold">×<span lang="EN-US">> 。</span></span></font>
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