The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by （）.<br>A:large conical springs<br>B:compressed air pressure<br>C:hydraulic pressure<br>D:exhaust gas pressure

The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by （）.
A:large conical springs
B:compressed air pressure
C:hydraulic pressure
D:exhaust gas pressure

出自：海船船员证

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