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根据斯德哥尔摩运输管理局的试验，瑞典著名的沃尔沃汽车制造公司最近研制成一种能源再利用系统可使公共汽车的燃料消耗减少1／3。瑞典当局对这种油泵储能系统大感兴趣，已向该公司订购10辆改进了的公共汽车，进行扩大试验。这种公共汽车有一个普通的柴油发动机，但是传动轴却?
According to Stockholm Transport Administration tests, a well-known Swedish Volvo carmaker recently developed a system that reuses energy to reduce the fuel consumption of buses by a factor of three. The Swedish authorities are greatly interested in this type of oil pump energy storage system and have ordered 10 improved buses for the company to conduct the expansion test. This bus has an ordinary diesel engine, but the drive shaft is?