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單項(xiàng)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

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單項(xiàng)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

單項(xiàng)選擇題

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