单选题The cross-head shoes are white metal lined, grooves being cut horizontally on the face of the white metal to ensure （）.Aan adequate supply of lube oilBan adequate supply of fuel oilCan adequate supply of turbine oilDan adequate supply of cylinder oil
单选题
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
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