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單項選擇題

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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單項選擇題

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

單項選擇題

The cross-head shoes are white metal （）.

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

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