Starting air valves are held firmly on their seats by_______.A.cam rollers on the camshaft

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Starting air valves are held firmly on their seats by_______.

A.cam rollers on the camshaft

B.spring force

C.air pressure on top of the valve differential piston

D.air pressure on the bottom of the valve differential piston

请帮忙给出正确答案和分析,谢谢!

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