The demisters installed in a flash-type evaporator serve to ()
A. deaerate the first effect distillate
B. filter the condensed flash vapors
C. deaerate the first and second effect distillate
D. remove small water droplets entrained in the flashed vapor
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对于长期未使用的发电机组,启动前要在增压器进油口加入干净的机油。
A. 正确
B. 错误
There is something wrong with our radar.All kinds of objects can’t be clearly()within the definite range.
A. Shown
B. Expressed
C. Appeared
Displayed
碳和石墨材料属于多孔物质,衡量多孔物质的密度有两种测定方法。分别为()、()。