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

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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

单项选择题

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

单项选择题

Each crank is made up of two crank webs joined by a common（） to which the bottom endbearing is fitted.

A.throw
B.crankshaft
C.crankpin
D.crosshead