9%Ni钢球罐
X8Ni9 ethylene spherical tank
玻璃钢球阀
glass fibre reinforced plastic ball valve
不锈钢球阀
stainless steel ball valve
不锈钢球罐
stainless steel spherical tanks
不锈钢球形粉末
stainless steel spherical pellets
不锈钢球型房门锁
door lock with stainless steel knob
钢球尺寸精确化
proper determination of the ball diameter
钢球冲击器
steel ball percussion tools
钢球传动型接触式气动塞规
ball-driving contact-type air plug gauge