单项选择题
Because of the reduced （） in the vacuum boiling evaporator, some of the sea water boils as it flows through the tubes.
A.temperature B.water level C.pressure D.rate of flow
单项选择题 We use （） to distill fresh water from sea water.
单项选择题 In the condenser, the hot, high pressure refrigerant gas is cooled by the sea water and becomes（）.
单项选择题 The boiling and condensation points of a refrigerant depend on the （） exerted upon it.
