如图所示�们用手拉弹簧它就会伸长用手压弹簧它就会缩短.针对影响弹簧的伸长或缩短的因素请你提出一个猜想并简述验证猜想的实验方法.1 Template




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tomski如图所示�们用手拉弹簧它就会伸长用手压弹簧它就会缩短.针对影响弹簧的伸长或缩短的因素请你提出一个猜想并简述验证猜想的实验方法.1 coloring