单项选择题
If a refrigeration system were short of refrigerant, the condition would result in （）.
A.continuous running of the compressor B.high suction pressure C.high discharge pressure D.short cycling of the compressor on the water failure switch
单项选择题 Condensate must be drained from the intercooler and after-coolers of an air compressor because （）.
单项选择题 In the refrigeration system, a shortage of refrigerant is indicated by （）.
单项选择题 Which of the following conditions must exist for heat to flow from one object to another?（）
