20春学期《冶金反应工程学》在线平时作业3

adminhan

<div>判断题 活塞流反应器亦称理想管式反应器，平推流反应器，理想置换反应器。活塞流反应器器内物料浓度1）沿流动方向（轴向）是均匀的，2）沿径向是均匀的，仅沿流动方向（轴向）有变化，3）不仅沿流动方向（轴向）有变化，沿径向也有变化，4）不论沿轴向还是沿径向均无变化。</div>
A:2
B:0
C:0
D:0

选择正确说法
A:<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">冶金宏观动力学是以化学动力学为基础，接受它的全部理论成果。如对化学反应机理研究，化学反应级数，反应速度常数，反应活化能等，都是冶金宏观动力学必要的重要参数。把化学反应的研究置于反应器的环境中，强调反应过程与物质和能量传递过程的相互联系，并用数学语言来描述，着眼于数学模型的真实、简单和实用，是冶金宏观动力学的特征。</span>
B:<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">冶金宏观动力学是基于液体理论和固体理论，运用气体分子运动的碰撞理论和由统计力学、量子力学得到的绝对反应速度理论，它只研究化学反应机理，预测反应速度。不研究反应物如何达到反应区，产物怎样离开反应区，以及反应热的传递和反应区中温度分布对反应本身的影响。</span>
C:3
D:4

<div>冶金反应装置中的流体流动和混合情况、温度和浓度分布情况如何</div>
A:<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">都直接影响反应过程，<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">完全由构成该物料的诸微元在装置内的停留时间和所经历的温度和浓度的变化决定</span></span>
B:<div>与反应过程无关。最终离开反应装置的物料组成则</div>
C:<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">仅与化学反应微观机理有关。</span><p><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"></span></p>
D:<p><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">4</span></p>

<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">基元反应是</span>
A:<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">需要经过两步以上的简单反应才能完成的复杂反应</span>
B:<div>只需一步就能完成的简单反应。</div>
C:3
D:4

<p><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">以下各式中按转化率计的反应速度为：</span></span></p><p><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">1）<img height="49" width="93" alt="" src="http://file.open.com.cn/ItemDB/65699/4b4a7a70-640f-4888-aeb3-764f4d614c6a/201041611736492.gif" />2）<img height="49" width="97" alt="" src="http://file.open.com.cn/ItemDB/65699/4b4a7a70-640f-4888-aeb3-764f4d614c6a/201041611744696.gif" />3）<img height="49" width="92" alt="" src="http://file.open.com.cn/ItemDB/65699/4b4a7a70-640f-4888-aeb3-764f4d614c6a/201041611753915.gif" />4）<img height="49" width="83" alt="" src="http://file.open.com.cn/ItemDB/65699/4b4a7a70-640f-4888-aeb3-764f4d614c6a/20104161183743.gif" />5）<img height="49" width="105" alt="" src="http://file.open.com.cn/ItemDB/65699/4b4a7a70-640f-4888-aeb3-764f4d614c6a/20104161181387.gif" /></span></p>
A:5
B:6
C:6
D:6

<div><span>&nbsp;&nbsp;</span>判断题&nbsp;等温气相反应，如果反应开始时有反应物J和惰性气体各1/2，则膨胀率为：1）50%、 2）100%、3）200%&nbsp;</div>
A:1
B:0
C:0
D:0

<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">所谓传递（或称传输）是指：</span>
A:<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">电力的输送</span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> </span>
B:<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">热量的传递</span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 宋体; 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: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">电磁波信号的传递</span>
D:<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">动量、热量和质量的传递</span>

<p><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">以下各式中按单位相界面积计的反应速度是：</span></span></span></p><p><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">1）<img height="49" width="93" alt="" src="http://file.open.com.cn/ItemDB/65699/4b4a7a70-640f-4888-aeb3-764f4d614c6a/201041611736492.gif" />2）<img height="49" width="97" alt="" src="http://file.open.com.cn/ItemDB/65699/4b4a7a70-640f-4888-aeb3-764f4d614c6a/201041611744696.gif" />3）<img height="49" width="92" alt="" src="http://file.open.com.cn/ItemDB/65699/4b4a7a70-640f-4888-aeb3-764f4d614c6a/201041611753915.gif" />4）<img height="49" width="83" alt="" src="http://file.open.com.cn/ItemDB/65699/4b4a7a70-640f-4888-aeb3-764f4d614c6a/20104161183743.gif" />5）<img height="49" width="105" alt="" src="http://file.open.com.cn/ItemDB/65699/4b4a7a70-640f-4888-aeb3-764f4d614c6a/20104161181387.gif" /></span></p>
A:3
B:6
C:6
D:6

<div><span>&nbsp;<span>&nbsp;&nbsp;&nbsp;&nbsp; </span></span>判断题 在实际工业反应器中，物料的流动与理想流动模型往往都有程度不同的偏离，这种流动属于非理想流动。1）造成与活塞流偏离的情况有：涡流和湍动引起的轴向混合，层流引起的径向流速不均，填充不均匀引起的短路和沟流，此外也可能存在死角等。2）造成与活塞流偏离的情况有：短路、死角以及由于搅拌引起的再循环等。</div>
A:1
B:0
C:0
D:0

在一定温度下，化学反应<span>&nbsp;&nbsp;&nbsp;<img height="21" width="132" alt="" src="http://file.open.com.cn/ItemDB/65699/2595a1dd-8583-4b48-9357-7f09103d21d0/201041611235735.gif" /> </span>，的化学计量关系式为：<img height="47" width="276" alt="" src="http://file.open.com.cn/ItemDB/65699/2595a1dd-8583-4b48-9357-7f09103d21d0/201041611245860.gif" />，式中<img height="23" width="25" alt="" src="http://file.open.com.cn/ItemDB/65699/2595a1dd-8583-4b48-9357-7f09103d21d0/201041611256141.gif" />，<img height="23" width="24" alt="" src="http://file.open.com.cn/ItemDB/65699/2595a1dd-8583-4b48-9357-7f09103d21d0/201041611310548.gif" />，<img height="25" width="25" alt="" src="http://file.open.com.cn/ItemDB/65699/2595a1dd-8583-4b48-9357-7f09103d21d0/201041611319361.gif" />，<img height="24" width="23" alt="" src="http://file.open.com.cn/ItemDB/65699/2595a1dd-8583-4b48-9357-7f09103d21d0/201041611346611.gif" /><span>&nbsp;&nbsp;</span>
A:<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">分别表示四种物质的量</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> </span>
B:<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">分别表示这四种物质的反应速度</span>
C:<div>是反应方程式中各组分的化学计量系数。</div>
D:4

<div><span>&nbsp;&nbsp;</span>判断题 活塞流反应器器内发生恒容反应，此时，物料在反应器中的真实停留时间和空时<span> &nbsp;1</span>）数值上不相等、2）数值上相等。</div>
A:2
B:0
C:0
D:0

<div><span>&nbsp;&nbsp;</span>判断题 图5-7分别为三种理想反应器的反应物浓度、转化率及反应速度曲线，其中1）图（a）为全混流反应器的浓度、转化率、反应速度的变化图、2）图（b）为全混流反应器的浓度、转化率、反应速度的变化图&nbsp;3）图（c）为全混流反应器的浓度、转化率、反应速度的变化图。</div><p><img height="384" width="520" alt="" src="http://file.open.com.cn/ItemDB/65699/b1af23cd-1834-4fc5-a80b-d56e73a20994/201041611331609.gif" /></p>
A:3
B:0
C:0
D:0

<div><span>&nbsp;&nbsp;</span>判断题 全混流反应器也有多种名称，如连续搅拌槽式反应器（CSTR），连续流动搅拌釜反应器（CFSTR），理想混合反应器，返混反应器等。其基本特征是：1）器内物料的浓度和温度时时处处均相同、2）器内物料的浓度时时处处均相同，温度不同、3）器内物料的温度时时处处均相同，浓度不同、4）不同时刻，器内物料的浓度和温度各不相同。</div>
A:1
B:0
C:0
D:0

<div><span>&nbsp;<span>&nbsp;&nbsp;&nbsp;&nbsp; </span></span>判断题 根据内部年龄分布密度函数的定义可知，内部年龄分布密度函数的物理意义<em>I(t)dt </em>表示 1）在仍留在反应器内的流体中，停留t到t+dt之间的流体所占的分率，2）在流出反应器的流体中，停留t到t+dt之间的流体所占的分率， </div>
A:<span lang="EN-US" style="FONT-SIZE: 10.5pt; 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; mso-fareast-font-family: 宋体">1</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">）</span><span style="FONT-SIZE: 12pt; 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; mso-fareast-font-family: 宋体"> </span>
B:0
C:0
D:0

<div><span>&nbsp;<span>&nbsp;&nbsp; </span></span>判断题 1）不同时刻，全混流反应器器内物料的浓度和温度不同，2）<span>不同时刻，全混流反应器器内物料的浓度相同，温度不同，</span>3）<span>不同时刻，全混流反应器器内物料的浓度和温度完全相同。</span></div>
A:3
B:0
C:0
D:0

选择正确说法
A:<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">冶金宏观动力学把化学反应和与其相关的物质传递及能量传递结合起来研究，给出包括反应速度和物质传递速度的体系综合速度的数学表达式，并与表征反应器内流动、混合和质量与能量传递的数学模型表达式相关联，去求解反应器的主要性能指标和反应操作的最佳条件</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> </span>
B:<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">冶金宏观动力学是基于液体理论和固体理论，运用气体分子运动的碰撞理论和由统计力学、量子力学得到的绝对反应速度理论，它只研究化学反应机理，预测反应速度。不研究反应物如何达到反应区，产物怎样离开反应区，以及反应热的传递和反应区中温度分布对反应本身的影响。</span>
C:3
D:4

<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">反应器中进行的过程可分解为化学过程和包括流动、传质、传热在内的传递过程，其中<div><span>&nbsp;</span>1）化学过程的化学反应规律只与设备条件有关，与反应条件无关、2）流动、传质、传热等传递过程对化学反应速度无影响、3）化学反应规律与设备大小无关、4）传递过程伴随化学反应发生，虽然它并不改变化学反应的规律，但能影响反应场所的条件，从而影响最终的反应结果。5）传递规律可随设备而变，与所进行的化学反应类别并无直接关系。</div></span>
A:4，5
B:0
C:0
D:0

在一定温度下，化学反应<span>&nbsp;<img height="21" width="132" alt="" src="http://file.open.com.cn/ItemDB/65699/2160ecdf-3ff2-4895-8169-41f3e637eaab/201041611010278.gif" />&nbsp;&nbsp; </span>，的化学计量关系式为：<img height="47" width="276" alt="" src="http://file.open.com.cn/ItemDB/65699/2160ecdf-3ff2-4895-8169-41f3e637eaab/201041611029497.gif" />，式中<img height="15" width="13" alt="" src="http://file.open.com.cn/ItemDB/65699/2160ecdf-3ff2-4895-8169-41f3e637eaab/201041611050857.gif" />，<img height="19" width="13" alt="" src="http://file.open.com.cn/ItemDB/65699/2160ecdf-3ff2-4895-8169-41f3e637eaab/2010416111260.gif" />，<img height="17" width="13" alt="" src="http://file.open.com.cn/ItemDB/65699/2160ecdf-3ff2-4895-8169-41f3e637eaab/201041611114154.gif" />和<span>&nbsp;&nbsp;<img height="15" width="12" alt="" src="http://file.open.com.cn/ItemDB/65699/2160ecdf-3ff2-4895-8169-41f3e637eaab/201041611123561.gif" /></span>
A:是反应方程式中各组分的化学计量系数&nbsp;
B:<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">分别表示四种物质的量</span>
C:<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">分别表示这四种物质的反应速度</span>
D:4

<div><span>&nbsp;&nbsp;</span>判断题&nbsp;组合模型是将实际反应器内的流动，用不同的区域通过不同的相互连接方式组合而成的。这些区域包括1）BCMT、CCMT、CPFR；2）BCMT、CCMT、CPFR、短路流、循环流、死区；3）CCMT、CPFR、短路流、循环流、死区。</div>
A:<span lang="EN-US" style="FONT-SIZE: 10.5pt; 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; mso-fareast-font-family: 宋体">3</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">）</span>
B:0
C:0
D:0

<div>判断题&nbsp;某反应物A在反应前的初始浓度为 1.0 mol/L ，反应结束后变为0.2 mol/L ，则反应物A的转换率为：1）20% 、2）50% 、 3）80%&nbsp;、4）75% 。</div>
A:3
B:0
C:0
D:0