如图所示是自行车传动装置的示意图.假设踏脚板每2s转一圈要知道在这种情形下自行车前进的速度有多大还需测量哪些量 .请在图中用字母标注出来 Template




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tomski如图所示是自行车传动装置的示意图.假设踏脚板每2s转一圈要知道在这种情形下自行车前进的速度有多大还需测量哪些量 .请在图中用字母标注出来 coloring