单项选择题
A.return to a neutral position B.flood the evaporator C.open D.close
If an air compressor is used to supply air primarily to...
单项选择题If an air compressor is used to supply air primarily to the combustion control system and other pneumatic controllers, the entire system is known as the （）.
A.control air system B.forced draft air system C.supply air system D.ships service air system
When it is necessary to open a refrigeration system for...
单项选择题When it is necessary to open a refrigeration system for repairs and the system will be open for more than a few minutes, the open ends of the system should be （）.
A.dehydrated B.purged C.plugged D.evacuated
If an air compressor is used to supply compressed air t...
单项选择题If an air compressor is used to supply compressed air to outlets throughout the engine room and on deck of a vessel, the system is known as the （）.
A.combustion control air system B.supply air system C.ships service air system D.low pressure deck air system
