单项选择题
A.superheated B.super-cooled C.at or below the dew point D.All of the above
Before starting a reciprocating, steam-driven pump that...
单项选择题Before starting a reciprocating, steam-driven pump that has been idle for a period of time, you should （）.
A.open the steam line mot valve B.drain the steam cylinder C.close the steam cylinder drains D.open the liquid cylinder drains
When air becomes trapped in the hydraulic fluid of a st...
单项选择题When air becomes trapped in the hydraulic fluid of a steering system, the （）.
A.rudder will respond sluggishly B.hydraulic rams will over-speed C.sight glass will show bubbles D.ram relief valves will lift
If a refrigeration system were short of refrigerant, th...
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
