無
*注意事項(xiàng):
如圖所示,一根彈簧的自由端未掛重物時(shí)指針B正對(duì)刻度5,當(dāng)掛上80N重物時(shí)(未超出彈性限度)指針正對(duì)刻度45,若要指針正對(duì)刻度20,應(yīng)掛重物的重力為( )
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