如图所示的各种装置在使用过程中都可视为杠杆其中属于费力杠杆的是 A.用羊角锤起钉子b. 用镊子夹砝码c. 用瓶启子开瓶盖d. 用天平测 Template




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tomski如图所示的各种装置在使用过程中都可视为杠杆其中属于费力杠杆的是 a.用羊角锤起钉子b. 用镊子夹砝码c. coloring