单项选择题
Which of the following chemicals will be used where protection against caustic cracking is required in boiler treatment?（）
A.Sodium hydroxide
B.Sodium carbonate
C.Sodium nitrate
D.Sodium polyphosphate
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Coalescence is the breakdown of surface tension between oil droplets in an oil/water mixture, which causes them to join and （） in size.
A.expand
B.extract
C.increase
D.decrease -
单项选择题
When in operation, it is unavoidable that a small amount of oil （） through leakage, and in order to compensate for these leaks the system is connected to a feed pump.
A.escapes
B.overheats
C.expands
D.accelerates -
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For a L√Opurifier, if the back pressure of the oil outlet is too high, the interface between oil and water in the bowl will （）.
A.be interrupted
B.move downwards
C.move outwards
D.retain original position
