The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.
- Adirect action of cam shaft
- Bcompressed air pressure
- Chydraulic “push rods”
- Ddirect action of the main piston moving dow
问题
The opening of an exhaust valve on a m
参考解析：
分类：船舶动力装置题库,海船船员考试题库
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