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單項(xiàng)選擇題

Each journal and pin should be examined for （） and grooving.

A.bridges
B.recesses
C.rears
D.ridging

單項(xiàng)選擇題

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