?扁圆头铆钉

... 升高水密人孔 raised watertight manhole 扁圆头铆钉 raised-head rivet 凸头铆钉 raised-head rivet ...

?凸头铆钉

... raised-head rivet 扁圆头铆钉 raised-head rivet 凸头铆钉 raising funds 筹款 ...