單項(xiàng)選擇題

Air entering an air-cooled refrigeration system is indicated by （）.

A.frosting of the liquid line
B.higher than normal head pressure
C.a clear sight glass
D.abnormally cold reefer boxes

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When installing a hydraulic hose, which of the following precautions should be taken?（）

A.The hose should not be twisted
B.The hose should be protected with a sleeve if it is subjected to rubbing
C.There should be some slack in the hose
D.All of the above

單項(xiàng)選擇題

A lube oil filter can be used to remove most contaminants from lube oilA contaminant which will remain in the lube oil after filtering is （）.

A.acid
B.fuel oil
C.sediment
D.water