單項(xiàng)選擇題

Cracks in cylinder and cylinder covers may （） from unequal heating.

A.make
B.cause
C.result
D.produce

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單項(xiàng)選擇題

Cooling of engine is achieved by circulation a cooling liquid around internal passages within the （）.

A.boiler
B.heater
C.engine
D.cooler

單項(xiàng)選擇題

Cooling enables the engine metals （） their mechanical properties.

A.to retain
B.to remain
C.to maintenance
D.to have

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