单项选择题

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

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船舶动力装置

The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by （）.