允许从一种能源切换到另一种能源的驱动器类型。切换过程不会中断行程。因此，例如，当从室内使用改变为室外使用时，可以从电力驱动改变为内燃机驱动。
Drive type that allows switching from one energy source to another. The switch-over is carried out without interrupting the travel. Thus it is possible, for example, to change from electric drive to combustion-engine drive when changing from indoor use to outdoor use.
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