问题：
[单选题]机械循环热水采暖系统中的补水定压点,宜设置在循环水泵入口端的主要原因是( )。
A、使系统任意点的工作压力不大于系统静压
B、使系统任意点的工作压力不小于系统静压
C、可以降低系统的工作压力
D、可以降低补水泵的扬程
参考答案：
B
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