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單項選擇題

Close the （）.

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

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單項選擇題

Which pump is the self-priming pump?（）

A.turbine
B.centrifugal
C.ejector
D.mixed flow

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