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双层客车自问世以来,由于具有许多优越性,在国外、国内皆引起重视。双层客车的优越性主要有: (1)在相同旅客列车编组的情况下,双
Since the advent of double-decker buses, due to its many advantages, it has attracted great attention both at home and abroad. The advantages of double-decker buses are: (1) In the same grouping of passenger trains, double