Each cylinder liner on the marine medium speed engines （）.<br>A:is usually cooled by sea water<br>B:can be replaced when worn out<br>C:is in direct contact with the water in the bore of the cylinder<br>D:can t expand when heated

Each cylinder liner on the marine medium speed engines （）.
A:is usually cooled by sea water
B:can be replaced when worn out
C:is in direct contact with the water in the bore of the cylinder
D:can t expand when heated

出自：海船船员证

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