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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