?弹性道钉

... 弹性模数 Elastic modulus 弹性道钉 Elastic rail spike 弹性范围 Elastic range ...

?弹簧道钉

... 道钉;狗头钉;钩头钉track spike;rail spike;dog spike 弹簧道钉elastic rail spike 罗纹道钉screw spike ...