A.提高室外管網(wǎng)壓力 B.水泵加壓 C.高位水箱、消防水泵加壓 D.氣壓罐加壓
A.50 B.60 C.80 D.100
A.800pa;800pa B.600pa;1200pa C.1000pa;800pa D.800pa;1000pa