单选题About half an hour before the engine is required, cooling water at （） must be circulated.Amore than the working temperatureBless than the working temperatureCthe working temperatureDthe same as the surrounding temperature
单选题
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
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