如图2 1 2所示是实验时打点计时器打出的一段纸带abcdef是从所打点中选取的几个连续的点所用交流电源的�率为50hz则根据 Template




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tomski如图2 1 2所示是实验时打点计时器打出的一段纸带abcdef是从所打点中选取的几个连续的点所用交流电源的�率为50hz则根据 coloring