单项选择题
A.forged B.tapering C.drilling D.boring
The cross-head shoes are white metal lined, grooves bei...
单项选择题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
The cross-head shoes are white metal （）.A.liningB.lined...
单项选择题The cross-head shoes are white metal （）.
A.lining B.lined C.made D.in
The crankshafts of medium speed engines are almost inva...
单项选择题The crankshafts of medium speed engines are almost invariably solid （） from a single piece of steel.
A.forged B.cast C.made D.shrunk
