单选题The cooling system（） needs least maintenance work for in this kind of system（）Aopen；the minimum componentsBopen；the high cooling efficiencyCcentral；there are more coolers and a extra set of pumpsDcentral；there is only one component contacts seawater
单选题
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
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