单项选择题

Each piston stuffing box is provided with two sealing rings and three（）

A.packings
B.piston rings
C.distributor rings
D.scraper rings

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单项选择题

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

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

单项选择题

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

单项选择题

Each cylinder is closed at the top by a （）, made of a special heat-resistant steel.

A.cylinder liner
B.coupling flange
C.cylinder cover
D.piston crown