单项选择题
For an ordinary modem marine four-stroke engine the inlet valves close （）.
A.after TDC
B.before TDC
C.after BDC
D.before BDC
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相关考题
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单项选择题
For an ordinary four-stroke engine the inlet valves open （）
A.after TDC
B.before TDC
C.after BDC
D.before BDC -
单项选择题
For an ordinary four-stroke engine the exhaust valves open （）.
A.after TDC
B.before TDC
C.after BDC
D.before BDC -
单项选择题
For an ordinary four-stroke diesel engine the exhaust valves close （）.
A.after TDC
B.before TDC
C.after BDC
D.before BDC
