6.如图3所示是脚踩式垃圾箱的示意图 下列说法中正确的是 A.两杠杆均为省力杠杆 B.两杠杆均为费力杠杆 C.abc为省力杠杆 D Template




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tomski6.如图3所示是脚踩式垃圾箱的示意图 下列说法中正确的是 a.两杠杆均为省力杠杆 coloring