单选题Each cylinder liner on the marine medium speed engines （）.Ais usually cooled by sea waterBcan be replaced when worn outCis in direct contact with the water in the bore of the cylinderDcan t expand when heated
单选题
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
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