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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

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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彎曲應力
B.torsion stresses扭轉應力
C.shear stresses剪應力
D.All of the above

單項選擇題

The crankshaft of diesel engine is supported by （）.

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

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