Large crosshead type engine generally has two lubrication systems, a function performed only by cylinder oil system is（）<br>A:lubricating<br>B:cooling<br>C:sealing<br>D:cleaning

Large crosshead type engine generally has two lubrication systems, a function performed only by cylinder oil system is（）
A:lubricating
B:cooling
C:sealing
D:cleaning

出自：海船船员证

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