问题描述：
[单选]
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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答案解析：无
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上一篇：The cylinder and piston must be warmed up（）to a temperature of about 140 degF in standing by engine．
下一篇：The cross-head shoes are white metal（）．
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