单项选择题
A.pressure B.temperature C.density D.volume
Because of the reduced （） in the distillation system, s...
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.
In a vacuum distillation system, the case is the higher...
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
A hydraulic machine is one that uses （） to do work.A.li...
单项选择题A hydraulic machine is one that uses （） to do work.
A.liquid B.steam C.gas D.electricity
