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已知X N μ,σ2 时,P μ﹣σ X μ σ 0.6826,P μ﹣2σ X μ 2σ 0.9544,P μ﹣3σ X μ 3σ 0.9974,则 dx
???a2﹁ ﹁ 1 μR o﹁ 3
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羰基的特征

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