20春学期《工业通风与除尘》在线平时作业3

adminhan

风机压出段的全压和静压均为正值。<span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:错误
B:正确

不同的除尘器对不同粒径的粉尘除尘效率是完全不同的。<span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;</span></span>
A:错误
B:正确

距吸气口最远的有害物散发点，就是所谓控制点。
A:错误
B:正确

风机的效率为有效功率与轴功率之比。表明风机将输入功率转化为输出功率的程度。<span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:错误
B:正确

为了保证各送排风管达到预期的风量，两并联支管的阻力必须保持平衡，设计时，除尘系统两支管的阻力差应不超过<span style="mso-bidi-font-size: 10.5pt" lang="EN-US">15%</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'">。</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:错误
B:正确

风机的风压等于风管的阻力及出口动压损失之<span class="GramE">和</span>。<span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:错误
B:正确

柜式排风罩内发热量大，采用自然排风时，其最小排风量是按中和面高度不高于排风<span class="GramE">柜工作孔</span>上缘确定的。<span lang="EN-US"><o:p></o:p></span>
A:错误
B:正确

人体的冷热感觉与空气的温度、相对湿度、流速和周围物体表面温度等因素有关。<span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:错误
B:正确

风机的轴功率指单位时间内通过风机的空气所获得的实际能量<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'">它是风机的输出功率</span><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'">也称为空气功率。</span>
A:错误
B:正确

一般通风房间的气流组织有多种方式，设计时要根据有害物源的位置、工人操作位置、有害物性质及浓度分布等具体情况确定。<span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span>
A:错误
B:正确

旋风除尘器利用离心力捕集粉尘，筒体直径愈小，尘粒受到的惯性离心力愈大。目前常用的旋风除尘器直径一般不超过<u><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></u>。<span lang="EN-US"><o:p></o:p></span>
A:200mm<span style="mso-spacerun: yes">&nbsp;</span>
B:400mm<span style="mso-spacerun: yes">&nbsp;</span>
C:800mm<span style="mso-spacerun: yes">&nbsp;</span>
D:1000mm

粉尘的粒径分布也称为粉尘的分散度，若以颗粒的粒数表示所占的比例称为<u> <span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;</span><span style="mso-spacerun: yes">&nbsp;&nbsp;</span></span></u>。<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">频率分布</span></span></span>
B:质量分布
C:粒数分布
D:颗粒分布

当管段内空气流速不变时，风管的阻力是由降低空气的<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'">来克服的。</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'">动压</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'">静</span>压<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'">温度</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'">流量</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>

<span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">排风口的位置应根据生产设备的工作特点及含尘气流的运动规律确定，排风口应设在罩内压力<u><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></u>的部位。<span lang="EN-US"><o:p></o:p></span></span>
A:<span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">最高<span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;</span></span></span>
B:最低
C:适中
D:较小

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

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>

当一种物质的微粒分散在另一种物质之中，就构成了分散系统，当分散在气体中的微粒为固体时，通常称为<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:烟尘<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'">烟雾</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'">粉尘</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'">烟</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>

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>

风机吸入段的全压和静压均为<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'">，风机压出段的全压和静压一般情况下均是</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'">。</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'">正值</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'">正值</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'">正值</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'">负值</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'">负值</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'">正值</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'">负值</span><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'">负值</span>

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>

所谓<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'">就是合理地布置送、排风口的位置、分配风量以及选用风口形式，以便用最小的通风量达到最佳的通风效果。</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'">通风方法</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'">气流组织</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'">全面通风</span>

民用建筑大门<span class="GramE">空气幕常采用</span>的形式是<u><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></u>。<span lang="EN-US"><o:p></o:p></span>
A:<span class="GramE"><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">单侧送式空气</span></span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">幕</span>
B:送式空气幕
C:<span class="GramE">下送式空气</span>幕
D:<span class="GramE">双侧送式空气</span>幕

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

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>

为了保证各送、排风点达到预期的风量，两并联支管的阻力必须保持平衡。设计时，除尘系统并联支管的压力差不应超过<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:5%<span style="mso-spacerun: yes">&nbsp;&nbsp;</span>
B:10%<span style="mso-spacerun: yes">&nbsp;</span>
C:15%<span style="mso-spacerun: yes">&nbsp;</span>
D:20%

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>

中净化除尘器主要用于通风除尘系统，要求净化后的空气含尘浓度不超过<u><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp; </span><span style="mso-spacerun: yes">&nbsp;</span><span style="mso-spacerun: yes">&nbsp;&nbsp;</span></span></u>。<span lang="EN-US"><o:p></o:p></span>
A:1-2mg/m³<span style="mso-spacerun: yes">&nbsp; </span>
B:&nbsp;50<span style="mso-bookmark: OLE_LINK1"><span style="mso-bookmark: OLE_LINK2"><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">&mdash;<span lang="EN-US">100 mg/m³&nbsp;<span style="mso-spacerun: yes">&nbsp;</span></span></span></span></span>
C:100&mdash;<span lang="EN-US">200 mg/m³<span style="mso-spacerun: yes">&nbsp;</span></span>
D:5-10 mg/m<u>³</u>

在有害物产生地<span class="GramE">点直接</span>将他们捕集起来，经过净化处理，排至室外，这种通风方法称为<u><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes">&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'">局部通风</span>
B:<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'">全面通风</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'">自然通风</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'">稀释通风</span>