题目内容

冷冻水系统为开式系统的缺点（）。

A. 冷水与大气接触，循环水中含氧量高，易腐蚀管道；
B. 水泵的扬程除需要克服管路阻力外，还需具有把水提升到某一高度的压头，因此，水泵扬程和能耗较大；
C. 冷水温度波动较小
D. 如果采用自流回水，回水的管径较大，会增加投资

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