The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.<br>A:direct action of cam shaft<br>B:compressed air pressure<br>C:hydraulic “push rods”<br>D:direct action of the main piston moving down

The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.
A:direct action of cam shaft
B:compressed air pressure
C:hydraulic “push rods”
D:direct action of the main piston moving down

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