单项选择题
A.pressure B.temperature C.density D.volume
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
If oil density were greater than water’s, the oil separ...
单项选择题If oil density were greater than water’s, the oil separator （）.
A.did work B.would work well C.didnt work D.wouldnt work
