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铁轨之间为什么要连接几根铁丝?科普轨道谜团,原来作用这么大!
机械爪将面条一样软绵绵的钢轨抓起,摆放在指定位置上,这是工人们正在铺设铁轨的画面。原来,刚出厂的钢轨柔韧性这么强。同时我们也发现,钢轨是一节节铺设的。 那每节钢轨之间都是靠什么连接的呢?
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