A large, low-speed, main propulsion diesel engine uses sea water to directly cool the （）.<br>A:cylinder heads<br>B:exhaust valves<br>C:scavenging air<br>D:injectors

A large, low-speed, main propulsion diesel engine uses sea water to directly cool the （）.
A:cylinder heads
B:exhaust valves
C:scavenging air
D:injectors

出自：海船船员证

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