问题描述：
[单选]
In the closed cooling system， the water（）．
A．is made to circulate out of the system
B．is made to circulate within the system
C．is made circulate within the system
D．is made circulate out of the system
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答案解析：无
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上一篇：The most important factor that causes the wear of the engine parts is（）．
下一篇：When the prime movers of two paralleled generators are equipped with mechanical- hydraulic governors， and are operating within their designed range， the unit with the least amount of speed droop will（）．
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