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