The young motorman as well as the others ______ to operate the oil separator.
A.has learnt
B.have learnt
C.learn
D.are learning
第1题
A.the scavenging air
B.the exhaust gases
C.the mixed air
D.the spray oil
第2题
A.the slewing motor
B.the luffing motor
C.the hoisting motor
D.none of the above
第3题
A.promote refrigerant dehydration
B.be absorbed in the receiver
C.cause low condensing pressure
D.carry moisture and lead to corrosion
第4题
A.fan
B.compressor
C.condenser
D.evaporator
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