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單項選擇題

The cross-head shoes are white metal （）.

A.lining
B.lined
C.made
D.in

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單項選擇題

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

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

單項選擇題

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

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