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關注:1
2013-05-23 12:21
求翻譯:Several threats challenge the validity of our within-student strategy. Computer purchases may correlate with broader changes in family circumstances, or may be directly responsive to revealed information about student performance. If families tend to buy computers following positive shocks to income, we run the risk是什么意思?![]() ![]() Several threats challenge the validity of our within-student strategy. Computer purchases may correlate with broader changes in family circumstances, or may be directly responsive to revealed information about student performance. If families tend to buy computers following positive shocks to income, we run the risk
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