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1973年12月,在美国的堪萨斯州威契托城召开的一次会议上,美国毕奇航空公司宣布,它已在五种不同情况下试验了液化天然气汽车燃料系统,其中包括小轿车、大轿车和载重卡车等,试验结果证明燃料费用低,性能良好。美国的其他一些公司也做了许多试验研究,均证明效果良好,有的已将用汽油的车辆改为汽油和液化天然气两用的车辆。华盛顿1972年底就已经有15辆油、气两用的中型公共汽车在人口密集的地区使用。其他如法国、意大利、西德和苏联等国也进行了许多试验研究,均取得了较好的效
In December 1973, at a meeting in the US city of Witchowa, Kansas, U.S. Biatch Airlines announced that it has tested liquefied natural gas vehicle fuel systems in five different situations, including cars, sedans And trucks, the test results show that low fuel costs, good performance. A number of other U.S. companies have also done a lot of pilot studies, all of which proved effective. Some have switched their gasoline-powered vehicles to gasoline and LNG dual-use vehicles. At the end of 1972, Washington already had 15 mid-sized buses that used oil and gas in densely populated areas. Others, such as France, Italy, West Germany and the Soviet Union, also carried out many experimental studies that achieved good results