图是脚踩式垃圾箱的示意图ba′为固定点在a点踩下通过连杆c b′把桶盖掀开.下列说法中正确的是aabc为省力杠杆ba′b′c′为 Template




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tomski图是脚踩式垃圾箱的示意图ba′为固定点在a点踩下通过连杆c b′把桶盖掀开.下列说法中正确的是aabc为省力杠杆ba′b′c′为 coloring