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【单选题】
按照有关的规定，热水锅炉及管网系统启动上水时，有关操作的表述错误的是()。A.
热水锅炉充水前应关闭所有的排水及疏水阀，打开所有空气阀，同时开启管网末端的连接供水与回水管的旁通阀
B.
充水至锅炉顶部、管网中、集气罐上的空气阀冒出水为止，关闭空气阀
C.
系统充满，锅炉房压力表指示读数不应低于管网中最高用户的静压或定压罐最低定压值
D.
系统充满，锅炉房压力表指示读数应为0
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