A、unusually solid welded
B、never be solid forged
C、almost invariably solid forged
D、almost invariably be welded
更多“Crankshafts of medium speed engines are （） from a single piece of steel.”相关的问题
A、a two-stroke engine can’t work without cylinders B、a two-stroke engine can’t work without pistons C、a two-stroke engine can’t work without crankshafts D、a two-stroke engine can’t work without a blower
A、splash method B、mechanical force feed lubricators C、detached sump method D、internal cooling passages in the crankshafts and connecting rods
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