The cooling system（） needs least maintenance work for in this kind of system（）<br>A:open；the minimum components<br>B:open；the high cooling efficiency<br>C:central；there are more coolers and a extra set of pumps<br>D:central；there is only one component contacts seawater

The cooling system（） needs least maintenance work for in this kind of system（）
A:open；the minimum components
B:open；the high cooling efficiency
C:central；there are more coolers and a extra set of pumps
D:central；there is only one component contacts seawater

出自：海船船员证

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