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單項選擇題

This used piston had been tested and approved as a spare part by the （） during last annual repair.

A.agent
B.shipchandler
C.surveyor
D.engineer

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單項選擇題

They understand the （） of automatic sludge discharging of the purifierBut they are not good in practice.

A.principle
B.principal
C.cause
D.case

單項選擇題

These piston rings are so badly worn that they must be （）.

A.renewed
B.welded
C.machined
D.chromium-plated

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