Crankshafts of medium speed engines are （） from a single piece of steel.<br>A:unusually solid welded<br>B:never be solid forged<br>C:almost invariably solid forged<br>D:almost invariably be welded

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

出自：海船船员证

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