问题描述：
[单选]
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 dow
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答案解析：无
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上一篇：The power output of a turbocharged diesel engine will drop if the cooling water flow through the after-cooler is interrupted because the（）．
下一篇：In a diesel engine， excessive cylinder liner wear will cause（）（1）increased blow-by
（2）wear between the piston ring and groove
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