單項(xiàng)選擇題The crown is fairly thick with the cylindrical parts () to a thinner section.

A.forged
B.tapering
C.drilling
D.boring


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1.單項(xiàng)選擇題The cross-head shoes are white metal lined, grooves being cut horizontally on the face of the white metal to ensure ().

A.an adequate supply of lube oil
B.an adequate supply of fuel oil
C.an adequate supply of turbine oil
D.an adequate supply of cylinder oil

2.單項(xiàng)選擇題The cross-head shoes are white metal ().

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

4.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

5.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