單項選擇題

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

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單項選擇題

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

單項選擇題

Each cylinder has one starting valve which is usually opened by air pressure and closed by （）

A.nuts and bolts
B.new joints
C.spring force
D.sealing rings

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Each cylinder liner on the marine medium speed engines （）.

你可能感興趣的試題

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

Each cylinder has one starting valve which is usually opened by air pressure and closed by （）