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單項(xiàng)選擇題

Crankshafts of medium speed engines are （） from a single piece of steel.

A.unusually solid welded
B.never be solid forged
C.almost invariably solid forged
D.almost invariably be welded

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單項(xiàng)選擇題

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

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

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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