For an ordinary four-stroke engine the exhaust valves open

【名词&注释】

柴油机船(motor ships)

[单选题]For an ordinary four-stroke engine the exhaust valves open （）.

A. after TDC
B. before TDC
C. after BDC
D. before BDC

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学习资料：

[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（）。

A. 0.9892
B. 090
C. 0.852
D. 0.9955

[单选题]The part of a windlass which physically engages the chain during hauling or paying out is the（）.

A. devil's claw
B. bull gear
C. wildcat
D. cat head

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