单项选择题
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
A.increase the amount of cooling water to the condenser B.decrease the amount of cooling water to the condenser C.add more refrigerant to the system D.remove some refrigerant from the system
单项选择题 Which of the following statements is correct concerning heat transfer?（）
单项选择题 Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
单项选择题 The rate of heat transfer from a hot region to a cold region is affected most by the （）.
