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等政府剷雪車清理過路面就可以出街囉!! tvb now,tvbnow,bttvb5 I1 Y, m) O9 g+ m! S- r7 U9 J
有 D 州市(例如紐約市)會在路面撒鹽或者沙,鹽會融雪同冰,沙可以增加車輪對地面附著摩擦力(Traction)!!http://s9.tinypic.com/296fsw ...tvb now,tvbnow,bttvb* h: ~1 }' x9 A {
gracechanstuart 發表於 2016-12-9 05:18 AM we stopped using salt for years. sodium chloride is more environment friendly. |