玻纤风管
the fine tuber pipe of glass
薄钢板焊接风管
the steel sheet welds the wind duct
超级风管特点
characteristic of super ventilation duct
超宽大截面风管
super-wide large section air duct
大口径双层螺旋保温风管
large diameter two-layer spiral insulating air duc
镀锌铁皮风管
Galvanized iron sheet wind tube
二次风管超温
secondary air tube with overtemperature
二次风管烧坏
the destroy of secondary air pipe