神马作文网
weld
weld nipple
back weld和backing weld区别在那里
油井术语 slip on weld
tried,penang,weld Quay,怎么读
阀门行业的问题 deg butt weld
weld globe valve that has attached to
solder 和weld有什么区别?
Weld Quay和umbrella怎么读啊 求谐音
哪位仁兄帮我解释下WELD是什么意思?
英语翻译The effective weld length of continuous welding shall be
it takes speed to weld steel at this heat.意思