9%Ni钢球罐
X8Ni9 ethylene spherical tank
H型钢钢混叠合梁
H-formed steel concrete composite girder
ZG270-500铸钢活塞
ZG270-500 cast steel piston
玻璃钢-钢抽油杆
Fiberglass-steel Sucker Rod
玻璃钢—钢混合抽油杆
fiberglass—steel sucker rod string
玻璃钢球阀
glass fibre reinforced plastic ball valve