The cross-head shoes are white metal lined, grooves being cut horizontally on the face of the white metal to ensure （）.<br>A:an adequate supply of lube oil<br>B:an adequate supply of fuel oil<br>C:an adequate supply of turbine oil<br>D:an adequate supply of cylinder oil

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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