About half an hour before the engine is required, cooling water at _____ must be circulate

About half an hour before the engine is required, cooling water at _____ must be circulated.

A.more than the working temperature

B.less than the working temperature

C.the working temperature

D.the same as the surrounding temperature

请帮忙给出正确答案和分析，谢谢！

参考答案

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