【单选题】
pNa表测钠离子时,碱化后的pH-pNa(    )3。
A. 大于
B. 等于
C. 小于
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答案
A
解析
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循环水的碳酸盐硬度应(    )于循环水的极限碳酸盐硬度。
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绝对压力P绝与P表的关系是(    )。
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液体沸腾时,气体与液体同时存在,则( )。
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(    )的分子间隙最小。
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触电人心脏停止跳动时,应采用(     )法进行抢救。
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在表面式换热器中,冷流体与热流体按相反方向平行流动称为(    )。
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水在水泵中压缩升压可以看作是(    )。 (A)等温过程    (B)绝热过程     (C)等压过程
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在220V电源上串联下列四个灯泡,(    )灯最亮。 (A)150W     (B)100W     (C)60w     (D)40W
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【判断题】
0.01mol/L氢氧化钠溶液的pH值等于2。(   )
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在任何情况下,水的离子积都是10-14。(   )
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指示电极都是离子选择性电极。( )
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膜电位就是玻璃电极内部溶液与外部溶液之间产生的电位差。(   )
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一般来说,树脂的颗粒越小,交换反应速度越快,但压力损失相应增大。(   )
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【判断题】
在逆流再生固定床中,中间配水装置以上的树脂也起离子交换的作用。(   )
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由于温度对化学反应一般都有影响,所以化学仪表一般都有温度补偿元件或对水样采取恒温措施。(   )
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【判断题】
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电渗析除盐中的离子交换膜的作用与离子交换除盐中离子交换树脂的相同,都是起离子交换作用。(   )
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不同液体在相同压力下沸点不同,但同一液体在不同压力下沸点也不同。(   )
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【简答题】
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【简答题】
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4.锅内用磷酸盐处理时,加入过量有何危害?
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6.逆流再生固定床有哪些优点?
【简答题】
7.简述凝结水处理覆盖过滤器的工作原理。
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