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- 1请你想象一下,如果“声音的速度变为0.1m/s”,我们的世界会有什么变化?请写出三个有关的合理场景.
- 2今年,爷爷的年龄是小明年龄的6倍.若干年后,爷爷的年龄将是小明年龄的5倍.再过若干年,爷爷的年龄将是小明年龄的4倍.求爷爷今年的年龄.
- 3she said that if i studied hard,she would buy me a new bike.为什么不是study
- 4my watch doesn't work .I must have it repard
- 5在△ABC中,∠BAC=90°,D是BC的中点,AE⊥AD,交CB的延长线于点E.求证:EA^2=EB*EC
- 6服装店卖裤子衣服,衣服售价300,赚了百分之50,裤子180,亏了百分之40,衣服裤子卖出,赚了还是亏了?
- 7修改下列搭配不当的词语,将正确的写在括号里.
- 8制备碱式碳酸铜的几种方法
- 9The houses in this a_____ are very expensive.You shouid k_____ at the door if you want somebody to
- 10附加题: 甲、乙两堆煤,如果乙堆增加20吨,就与甲堆同样多;如果甲堆增加260吨,就等于乙堆煤重量的3倍.甲、乙两堆煤各重多少吨?