【单选题】
For an ordinary modem marine four-stroke engine the inlet valves close （）.
A、after TDC
B、before TDC
C、after BDC
D、before BDC
查看正确答案A、after TDC B、before TDC C、after BDC D、before BDC
搜题
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第5题
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第6题
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第7题
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第8题
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第9题
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