单项选择题
A.repeatedly B.quickly C.gradually D.immediately
The crown is fairly thick with the cylindrical parts （）...
单项选择题The crown is fairly thick with the cylindrical parts （） to a thinner section.
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
