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问题

For an ordinary modem marine four-stroke engine the inlet valves close _____.A.after TDCB.


For an ordinary modem marine four-stroke engine the inlet valves close _____.

A.after TDC

B.before TDC

C.after BDC

D.before BDC

请帮忙给出正确答案和分析,谢谢!

参考答案
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