单项选择题

Cracks in the cylinders and cylinder covers may （） unequal heating.

A.result from
B.result in
C.give out
D.given from

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单项选择题

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

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

单项选择题

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

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

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