Cooling of engines is achieved by _____ a cooling liquid around internal passages within t

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Cooling of engines is achieved by _____ a cooling liquid around internal passages within the engine.

A.flowed

B.flowing

C.mixing

D.circulating

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗