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 （）.<br>A:starting air and fuel pumps<br>B:piston cooling pumps<br>C:exhaust valves<br>D:all of the above

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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