单项选择题

Because of the reduced （）in the distillation system, some of the sea water boils as it flows through the tubes of the evaporator.

A.pressure
B.temperature
C.density
D.volume

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单项选择题

Because of the reduced （） in the distillation system, some of the sea water boils as it flows through the tubes of the evaporator.

A.pressure
B.temperature
C.density
D.volume

单项选择题

In a vacuum distillation system, the case is the higher the pressure, （）.

A.the saturation temperature is higher
B.the higher the saturation temperature
C.the higher is the saturation temperature
D.the saturation temperature is more high

单项选择题

A hydraulic machine is one that uses （） to do work.

A.liquid
B.steam
C.gas
D.electricity