单项选择题
The air charge leaving an intercooler, or after-cooler of an air compressor can be expected to be （）.
A.superheated B.super-cooled C.at or below the dew point D.All of the above
单项选择题 Before starting a reciprocating, steam-driven pump that has been idle for a period of time, you should （）.
单项选择题 When air becomes trapped in the hydraulic fluid of a steering system, the （）.
单项选择题 If a refrigeration system were short of refrigerant, the condition would result in （）.
