Road vehicles. Seft sustained heating systems installed on commercial vehicles over 3,5 T gvw(R). Part 4 : specific safety requirements for vehicles transporting dangerous goods.是什么意思_Road vehicles. Seft sustained heating systems installed on commercial vehicles over 3,5 T gvw(R). Part 4 : specific safety requirements for vehicles transporting dangerous goods.在线翻译_英语_读音_用法_例句