全省20多万台农用拖拉机换发“九二”式问证后将n崭新的经落、整齐的车容出现在田野、诸因上从1997年4月1日至1997年12月31日止。换发期间新旧牌证同时有效。1998年1月1日起，现行的拖拉机牌证废止，凡未换发’九二“式牌证的拖拉机禁止上道路行驶。凡专门从事运输和既从事运输又从 More than 200,000 agricultural tractors in the province were exchanged for ”9 2“ type certification, and new brand new vehicles will appear in the fields. From April 1, 1997 to December 1997 31st New and old card renewal period valid at the same time. Since January 1, 1998, the current tractor license has been abolished, and trailers that have not been issued with the ”1992" license are forbidden to drive on roads. Those who specialize in transportation and both engage in transportation and from