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單項選擇題

The younger motorman as well as the others （） to operate the oil separator.

A.has learnt
B.have learnt
C.learn
D.are learning

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A water pump can not supply water after startingIt may be caused by （）.

A.closed discharge valve
B.broken pipe line
C.worn shaft
D.both A and B

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Dress up the （）.

A.keyway
B.shaft
C.valve
D.casing

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