A.-0.6m B.3.4m C.15.4m D.15.2m
A.DN40 B.DN50 C.DN65 D.DN100
A.熱鍍鋅襯塑復(fù)合管 B.機(jī)制鑄鐵管 C.螺旋塑料管 D.UPVC管