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單項(xiàng)選擇題

The crankshafts of medium speed engines are almost invariably solid （） from a single piece of steel.

A.forged
B.cast
C.made
D.shrunk

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單項(xiàng)選擇題

The crankshaft receives and transmits the full working power of the engine and is subjected to fluctuating （）.

A.bending stresses彎曲應(yīng)力
B.torsion stresses扭轉(zhuǎn)應(yīng)力
C.shear stresses剪應(yīng)力
D.All of the above

單項(xiàng)選擇題

The crankshaft of diesel engine is supported by （）.

A.tension stretch
B.tie rods
C.through bolts
D.main bearings