单项选择题
When refrigerant leaves the receiver, it flows next on to the （）.
A.evaporator coils B.liquid strainer C.compressor D.condenser
单项选择题 A compound gauge is typically installed on the （）.
单项选择题 Which of the listed statements is correct concerning the starting of centrifugal pumps?（）
单项选择题 Excessive oil foaming in the crankcase of a refrigeration compressor at start up can cause（）.
