单项选择题
A.1.8m B.2.4m C.3.0m D.3.5m
DN50铜管水平管安装的支架间距()A.1.8mB.2.4mC.3.0mD.3.5m
单项选择题DN50铜管水平管安装的支架间距()
DN40铜管垂直安装的支架间距()A.1.8mB.2.4mC.3.0mD.3.5m
单项选择题DN40铜管垂直安装的支架间距()
DN32铜管垂直安装的支架间距()A.1.8mB.2.4mC.3.0mD.3.5m
单项选择题DN32铜管垂直安装的支架间距()