20春学期《工业通风与除尘》在线平时作业2

adminhan

槽边排风罩的布置方式不会影响排风罩的排风量。<span lang="EN-US"><o:p></o:p></span>
A:错误
B:正确

旋风除尘器主要用于<span style="mso-bookmark: OLE_LINK1"><span style="mso-bookmark: OLE_LINK2"><span style="mso-bidi-font-size: 10.5pt" lang="EN-US">1<span style="POSITION: relative; TOP: 5pt; mso-text-raise: -5.0pt"></span></span></span></span><span style="mso-bookmark: OLE_LINK1"><span style="mso-bookmark: OLE_LINK2"><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'"><img width="20" height="12" alt="" src="http://file.open.com.cn/ItemDB/88706/93d2287c-8b9d-414a-b23a-2a4ffc04554d/2011225101441580.jpg" />以上的粉尘。</span></span></span><span style="mso-bookmark: OLE_LINK1"><span style="mso-bookmark: OLE_LINK2"><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp;</span></span></span></span>
A:错误
B:正确

按照通风动力的不同，通风系统可以分为机械通风和局部通风两类。<span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:错误
B:正确

轴流风机的风量和风压范围大<span style="mso-bidi-font-size: 10.5pt" lang="EN-US">, </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'">在通风工程中被广泛应用。</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:错误
B:正确

要使全面通风效果良好，只需要足够的通风量。<span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:错误
B:正确

为了防止对环境的污染，排风口应设在有害物浓度低的区域。<span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:错误
B:正确

风机转速改变时，风机的流量、风压和效率都将随之改变。<span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:错误
B:正确

水泥<span class="GramE">尘</span>可选用湿式除尘器收集。<span style="mso-bookmark: OLE_LINK1"><span style="mso-bookmark: OLE_LINK2"><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span></span></span>
A:错误
B:正确

局部排风系统需要的风量小、效果好，设计时应优先考虑。<span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:错误
B:正确

单靠通风方法防治工业有害物，既不经济也达不到预期的效果，必须采取综合措施。<span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:错误
B:正确

高效文氏管除尘器的喉管流速高达<span lang="EN-US">60~120m/s</span>，对小于<span lang="EN-US">1<img width="20" height="12" alt="" src="http://file.open.com.cn/ItemDB/88706/0ff6d42c-a58b-4328-bb2b-aed02168a406/2011225103326685.jpg" /></span>粉尘的效率可达到<u><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></u>，但阻力也高达<span lang="EN-US">5000~10000Pa</span>。<span lang="EN-US"><o:p></o:p></span>
A:99%~99.9%
B:98%~99%<span style="mso-spacerun: yes">&nbsp;</span>
C:90%~95%<span style="mso-spacerun: yes">&nbsp;&nbsp;</span>
D:95%~98%

除尘风管应尽可能垂直或倾斜敷设，倾斜敷设时与水平面的夹角最好大于<u><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></u><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'">度。</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:20<span style="mso-spacerun: yes">&nbsp;&nbsp;</span>
B:30<span style="mso-spacerun: yes">&nbsp;&nbsp;</span>
C:45<span style="mso-spacerun: yes">&nbsp;</span>
D:60<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;</span>

重力沉降室是通过重力使粉尘从气流中分离的，它仅适用于<u><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></u>的粉尘。<span lang="EN-US"><o:p></o:p></span> <p class="MsoNormal" style="LINE-HEIGHT: 20pt; tab-stops: 173.5pt; mso-line-height-rule: exactly"><span style="mso-bookmark: OLE_LINK1"><span style="mso-bookmark: OLE_LINK2"><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><span lang="EN-US"><o:p></o:p></span></span></span></span></p>
A:<p>20<img alt="" width="20" height="12" src="http://file.open.com.cn/ItemDB/88706/acfd601a-d07b-484d-be7b-4275d049b5bc/2011225103119852.jpg" />以上</p>
B:<p>10<img alt="" width="20" height="12" src="http://file.open.com.cn/ItemDB/88706/acfd601a-d07b-484d-be7b-4275d049b5bc/2011225103119852.jpg" />以上</p>
C:<p>50<img alt="" width="20" height="12" src="http://file.open.com.cn/ItemDB/88706/acfd601a-d07b-484d-be7b-4275d049b5bc/2011225103119852.jpg" />以上</p>
D:<p>100<img alt="" width="20" height="12" src="http://file.open.com.cn/ItemDB/88706/acfd601a-d07b-484d-be7b-4275d049b5bc/2011225103119852.jpg" />以上</p>

对于<span class="GramE">热过程</span>的通风柜，应将吸风口布设在通风柜的<u><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </span></span></u>，才能有效地控制有害物。<span lang="EN-US"><o:p></o:p></span>
A:&nbsp;<span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">上部<span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;</span></span></span>
B:下部<span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;</span></span>
C:中间<span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;</span></span>
D:上下均可

为减小局部阻力，布置管道时，应尽量取直线，减少弯头。圆形风管弯头的曲率半径一般应大于<u><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></u><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'">管径。</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:1<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'">倍</span>
B:1~2<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'">倍</span>
C: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'">倍</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;</span></span>
D:4<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'">倍</span>

粉尘在空气中的含量即含尘浓度有两种表示方法，一种是<strong style="mso-bidi-font-weight: normal"><u><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></u></strong><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'">，另一种是颗粒浓度。</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:<span class="SpellE">ppm</span>
B:<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'">质量浓度</span>
C:<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'">体积浓度</span>
D:<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'">分散度</span>

造成粉尘进一步扩散，污染车间空气环境的主要原因是二次气流，即由通风或<u><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </span></span></u><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'">所形成的室内气流。</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:<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'">扩散</span>
B:<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'">沉降作用</span>
C:<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'">冷热气流对流</span>
D:<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'">离心力作用</span>

由于通风、空调系统空气的流动都处于<span class="GramE">自模区</span>，局部阻力系数只取决于管件的<u><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></u><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'">。</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:<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'">长短</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;</span></span>
B:<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'">粗细</span>
C:<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'">粗糙度</span>
D:<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'">形状</span>

在生产车间，当生产设备偶然事故或故障时，会突然散发大量有害气体或有爆炸性的气体，应设置<u><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </span></span></u><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'">。</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:<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'">全面通风</span>
B:<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'">局部通风</span>
C:<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'">事故排风系统</span>
D:<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'">自然通风系统</span>

根据工业与民用建筑的使用要求，通风和空调系统的风管有时需要把<u><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></u><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'">的空气，沿风管侧壁的成排孔口或短管均匀送出。</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:<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'">等温</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span></span>
B:<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'">等湿</span>
C:&nbsp;<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'">等速</span>
D:<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'">等量</span>

槽边排风罩分为单侧和双侧两种，单侧<span class="GramE">适用于槽宽</span><u><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></u><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;</span></span>。<span lang="EN-US"><o:p></o:p></span>
A:B<span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">&le;<st1:chmetcnv tcsc="0" numbertype="1" negative="False" hasspace="False" sourcevalue="700" unitname="mm" w:st="on"><span lang="EN-US">700mm</span></st1:chmetcnv></span>
B:<span class="SpellE">B</span>&le;<st1:chmetcnv tcsc="0" numbertype="1" negative="False" hasspace="False" sourcevalue="800" unitname="mm" w:st="on"><span lang="EN-US">800mm</span></st1:chmetcnv><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;</span></span>
C:&nbsp;B&le;<st1:chmetcnv tcsc="0" numbertype="1" negative="False" hasspace="False" sourcevalue="900" unitname="mm" w:st="on"><span lang="EN-US">900mm</span></st1:chmetcnv>
D:B&le;<st1:chmetcnv tcsc="0" numbertype="1" negative="False" hasspace="False" sourcevalue="1200" unitname="mm" w:st="on"><span lang="EN-US">1200mm</span></st1:chmetcnv>

全面通风效果与车间的气流组织方式密切相关，设计时，送风口的位置应尽量<u><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></u><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'">操作地点。</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:<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'">远离</span>
B:<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'">靠近</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp;</span></span>
C:<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'">避开</span>
D:<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'">正对</span><span style="mso-bidi-font-size: 10.5pt"> </span>

卫生标准中规定的车间空气中有害物的最高容许浓度，是从工人在此浓度下<strong style="mso-bidi-font-weight: normal"><u><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></u></strong><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'">进行生产劳动，不会引起急性或慢性职业病为基础制定的。</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:<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'">长期</span>
B:<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'">短期</span>
C:<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'">间歇</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp;</span></span>
D:&nbsp;<span class="GramE"><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'">一</span></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'">日内</span>

选用除尘器时要注意风量变化对除尘器效率和阻力的影响，旋风除尘器的效率和阻力是随风量的增加而<u><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></u>的，电除尘器的效率是随风量的增加而<u><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></u>的。<span lang="EN-US"><o:p></o:p></span>
A:<span style="mso-bookmark: OLE_LINK1"><span style="mso-bookmark: OLE_LINK2"><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">下降 下降</span></span></span>
B:增加<span lang="EN-US"><span style="mso-spacerun: yes">&nbsp; </span></span>下降
C:增加<span lang="EN-US"><span style="mso-spacerun: yes">&nbsp; </span></span>增加
D:下降<span lang="EN-US"><span style="mso-spacerun: yes">&nbsp; </span></span>增加

风管内空气流速对通风、空调系统的经济性有较大的影响。<span style="mso-bidi-font-size: 10.5pt"> </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'">流速低，风管断面</span><u><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></u><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'">，系统阻力</span><u><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></u><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'">。</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:<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'">小</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp; </span></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'">大</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp;</span></span>
B:<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'">大</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp; </span></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'">小</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;</span></span>
C:<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'">大</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp; </span></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'">大</span>
D:<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'">小</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp; </span></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'">小</span>

细小的粉尘本身没有独立运动的能力，一次<span class="GramE">尘</span>化作用给予粉尘的能量是<u><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </span><span style="mso-spacerun: yes">&nbsp;</span></span></u><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'">使粉尘扩散飞扬的。</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:<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'">不足以</span>
B:<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'">足以</span>
C:<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'">不一定</span>
D:<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'">有可能</span>

凡属机械破碎筛分的粉尘大多符合<u><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp; </span><span style="mso-spacerun: yes">&nbsp;&nbsp;</span><span style="mso-spacerun: yes">&nbsp;&nbsp;</span></span></u>，特别是舍弃两端的粗大和细小尘粒以后。<span lang="EN-US"><o:p></o:p></span>
A:<span style="mso-bookmark: OLE_LINK1"><span style="mso-bookmark: OLE_LINK2"><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">正态分布</span></span></span>
B:对数正态分布
C:威布尔分布
D:不确定的分布

对于<span class="GramE">冷过程</span>的通风柜，应将吸风口布设在通风柜的<u><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></u>，才能有效地控制有害物。<span lang="EN-US"><o:p></o:p></span>
A:<span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">上部<span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;</span></span></span>
B:下部<span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;</span></span>
C:中间
D:上下均可

电除尘器是利用电场力使尘粒从气流中分离的设备，对粒径<u><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></u>的尘粒，效率可达<span lang="EN-US">98%~99%</span>。<span lang="EN-US"><o:p></o:p></span> <p class="MsoNormal" style="LINE-HEIGHT: 20pt; tab-stops: 173.5pt; mso-line-height-rule: exactly"><span style="mso-bookmark: OLE_LINK1"><span style="mso-bookmark: OLE_LINK2"><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p></o:p></span></span></span></p>
A:<p>2<img alt="" width="20" height="12" src="http://file.open.com.cn/ItemDB/88706/acfd601a-d07b-484d-be7b-4275d049b5bc/2011225103119852.jpg" /></p>
B:<p>5<img alt="" width="20" height="12" src="http://file.open.com.cn/ItemDB/88706/acfd601a-d07b-484d-be7b-4275d049b5bc/2011225103119852.jpg" /></p>
C:<p>10<img alt="" width="20" height="12" src="http://file.open.com.cn/ItemDB/88706/acfd601a-d07b-484d-be7b-4275d049b5bc/2011225103119852.jpg" /></p>
D:<p>1~2<img alt="" width="20" height="12" src="http://file.open.com.cn/ItemDB/88706/acfd601a-d07b-484d-be7b-4275d049b5bc/2011225103119852.jpg" /></p>

在<span class="GramE">不</span>设有组织自然通风的房间中，当机械进、排风量相等时，室内压力等于室外大气压力。当机械进风量小于机械排风量时，室内处于<u><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></u><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp;</span></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'">状态。</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:<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'">负压</span>
B:<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'">正压</span>
C:&nbsp;<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'">大气压</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&nbsp;</span></span>
D:<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'">零压</span>