有两个完全相同的轻质弹簧不受拉力作用时每根长20厘米.当在弹簧下端悬挂100克砝码时弹簧伸长2厘米.今将两弹簧串接起来如图甲再在下端 Template




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tomski有两个完全相同的轻质弹簧不受拉力作用时每根长20厘米.当在弹簧下端悬挂100克砝码时弹簧伸长2厘米.今将两弹簧串接起来如图甲再在下端 coloring