單項選擇題

The presence of bubbles in a refrigeration system liquid line may （）.

A.promote refrigerant dehydration
B.be absorbed in the receiver
C.cause low condensing pressure
D.carry moisture and lead to corrosion

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單項選擇題

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

單項選擇題

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