题目内容
所有配合物都是由内界和外界两部分组成的。
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弱碱的解离常数Kb 只与溶液温度有关，而与其浓度无关。
Whereas it is true that more disengaged students are more likely to work long hours to begin with, it appears that working makes a marginal situation worse.
According to our study, alcohol and drug use, in turn, may be linked to disengagement from school, and therefore, is likely to depress school performance.
Our findings indicate that for many students, working 20 hours or more a week can contribute to decreased school performance and increased drug and alcohol use.
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