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
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相关考题
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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 -
单项选择题
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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During the suction stroke, the piston is moving （）.
A.inwards
B.outwards
C.downwards
D.upwards
