Specification for standard automatic roller - type coupling for semi - trailers not exceeding 71 4 tons laden weight 载重量不超过7 . 25吨的半挂车的标准自动滚柱式联轴节规范
2.
Specification for standard automatic roller - type coupling for semi - trailers of 7 tons to 143 4 tons laden weight 装载重量为7至14 . 25吨的半挂车用的标准自动滚柱式连接器规范
3.
Road vehicles . vibrations transmitted by the seats of commercial vehicles of laden weight greater than 12 tons . test methods 道路车辆. 12吨以上ptac实用车辆座位的传递振动情况.试验方法