For an ordinary four-stroke diesel engine the exhaust valves close （）.<br>A:after TDC<br>B:before TDC<br>C:after BDC<br>D:before BDC

For an ordinary four-stroke diesel engine the exhaust valves close （）.
A:after TDC
B:before TDC
C:after BDC
D:before BDC

出自：海船船员证

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