（） is sometimes used for piston cooling since leaks into the crankcase would not cause problems.<br>A:Diesel oil<br>B:Hydraulic oil<br>C:Lube oil<br>D:Mineral oil

（） is sometimes used for piston cooling since leaks into the crankcase would not cause problems.
A:Diesel oil
B:Hydraulic oil
C:Lube oil
D:Mineral oil

出自：海船船员证

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