单项选择题

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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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
单项选择题
Cracks in cylinder and cylinder covers may （） from unequal heating.

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