Each crank is made up of two crank webs joined by a common（） to which the bottom endbearing is fitted.

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.

During the suction stroke, the piston is moving （）.A.in...

单项选择题During the suction stroke, the piston is moving （）.

During the inspection, the starting air valves should b...

单项选择题During the inspection, the starting air valves should be closed （） the engine from turning.