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- 2请问初三化学离子右上角的符号是正是负,后面写的数字是几.如何判断?离子符号是什么?
- 3为什么stay的现在分词是staying,而不是stayying
- 4can you tell me where she is
- 5所有正奇数组成的集合描述法表示为{X│X=2N+1,N表示自然数},为什么?
- 6How long time does it take you to go to work every day 这里用了time
- 7what's the weather like in this season?
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- 10数列an中,a1=1,a1a2……an=n²,求a3+a5