单项选择题
A.promote refrigerant dehydration B.be absorbed in the receiver C.cause low condensing pressure D.carry moisture and lead to corrosion
Air entering an air-cooled refrigeration system is indi...
单项选择题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
When installing a hydraulic hose, which of the followin...
单项选择题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
A lube oil filter can be used to remove most contaminan...
单项选择题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
