问题描述：
[单选]
In order to reverse the rotation of a two-stroke/cycle loop scavenged， direct reversing， propulsion diesel engine， the cam positions must be changed for the（）．
A．starting air and fuel pumps
B．piston cooling pumps
C．exhaust valves
D．all of the above
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答案解析：无
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上一篇：Misalignment of the drive shaft and propeller shaft flanges can be detected by using a dial indicator or（）．
下一篇：A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the（）（1）MEP is lower and the scavenging air is cooling the exhaust gases
（2）valve overlap in a four-stroke
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