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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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單項選擇題

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

單項選擇題

During working, when the piston is near the （）, the air ignites the fine spray of fuel.

A.TDC
B.DTC
C.BDC
D.BCD

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