About half an hour before the engine is required, cooling water at （） must be circulated.<br>A:more than the working temperature<br>B:less than the working temperature<br>C:the working temperature<br>D:the same as the surrounding temperature

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

出自：海船船员证

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