在“探究两个互成角度的力的合成规律”的实验中,如图甲所示,其中a为固定橡皮筋的图钉,oa与ob为细绳,用两个弹簧测力计同时拉两根细绳如图甲所示 Template


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tomski在“探究两个互成角度的力的合成规律”的实验中,如图甲所示,其中a为固定橡皮筋的图钉,oa与ob为细绳,用两个弹簧测力计同时拉两根细绳如图甲所示 coloring