A.DN100
B.DN80
C.DN70
D.DN50
A.DN100
B.DN80
C.DN70
D.DN50
A.保证水流速度
B.防止沉积堵塞
C.提高水流量
D.减少管道磨损
A.0.5
B.0.75
C.0.85
D.1.0
A.200
B.300
C.400
D.500
A.0.002
B.0.003
C.0.005
D.0.010
A.检查井
B.跌水井
C.水封井
D.换气井
A.0.002
B.0.003
C.0.005
D.0.010
A.200;0.003
B.200;0.01
C.300;0.003
D.300;0.01
A.75mm
B.100mm
C.65mm
D.80mm