如右图，分别用大小相等的力拉或压同一弹簧。该实验表明，弹簧受力产生的效果与力的（）

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A：大小、方向、作用点都有关

B：作用点有关

C：大小有关

D：方向有关

上一题下一题 0.0难度选择题更新时间:2018-10-26 10:20:10

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D

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The bird and the tree are friends．The bird often sings songs in the tree．Autumn comes．The bird has to fly to the south．Spring comes.The bird comes back，but she can’t see the tree．Grass tell her some workers cut the tree down and took him to a factory．Then the bird flies to the factory．The workers told her they cut the tree into wood．They used the wood to make matches．Then they took the matches to a village．The bird flies to the village and sees a girl used the last match to make the fire．The bird sings a sad song to the fire．

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