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最佳答案:第一句不是机译的,参考..物质发生化学变化是旧键的断裂新键的形成过程.在氧化还原反应中反应物发生化学变化伴随着电子的转移,电子的转移数与物质的结构有关,并决定物
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最佳答案:we are sorry that this situation arouse,we think the possible reason for the goo
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最佳答案:Learning is a professor or experience gained through knowledge, skills, attitude
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最佳答案:A stochastic process,if its mathematic expectation,the variance along with the t