详细说明
76*3.5=6.77….83*3.5=22.22…89*3.5=7.86….95*4=11.61….102*4=17.431
114*4=9.27 …140*4.5=12.763….140*5=17.844….159*6=4.169….180*6=5.88
203*6=9.513…203*12=5.086….203*14=9.774….203*16=4.810
245*8=10.198…245*16=2.953…273*10=4.693….273*12=4.325
直缝焊管Q345B