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單項(xiàng)選擇題

Heat energy is a source of power, but （） will cause damage to the engine.

A.excessive heat
B.insufficient heat
C.effective cooling
D.high output

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單項(xiàng)選擇題

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

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

單項(xiàng)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

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