单项选择题
A.cylinder liner B.coupling flange C.cylinder cover D.piston crown
Each cylinder has one starting valve which is usually o...
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
Each crank is made up of two crank webs joined by a com...
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
During working, when the piston is near the （）, the air...
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
