正确答案: D
before BDC
题目:For an ordinary four-stroke engine the exhaust valves open ().
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[单选题]根据46艘柴油机船的调查统计,航行总时间达111万h,此期间主机停车和减速故障共1200次,如通过某运河的时间为10h,则过某运河的可靠度为()。
0.9892
[单选题]The part of a windlass which physically engages the chain during hauling or paying out is the().
wildcat