题目：
用力拉弹簧，弹簧就___________；用同样大小的力压弹簧，弹簧就_________。这个现象说明力的________与力的___________有关。
答案：
伸长；缩短；作用效果；方向
用力拉弹簧，弹簧就___________；用同样大小的力压弹簧，弹簧就_____
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