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單項選擇題

Head tank should be used to remove （） from cooling water.

A.scale
B.sludge
C.chemicals
D.air

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單項選擇題

He said that he had turned the main engine one complete revolution with the （）.

A.turning gear
B.steering gear
C.spur gear
D.chain gear

單項選擇題

Generally the gudgeon pin is fully floating in both connecting rod small end and （）.

A.the crosshead
B.the crankshaft
C.large end
D.the piston bosses

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