如图，分别用大小相等的力拉和压同一弹簧.该实验表明，弹簧受力产生的效果与力的（ ）
Chinese people invented.
There a book and two pens in the bag .
Did you it in your bag ?
There were sweets all.
Lucy played her toys yesterday .
.
a book and two pens in the bag .
it in your bag ?
all.
her toys yesterday .
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