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