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ݸٲϰҳѡƽеغ㶨
2016-12-08
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    1ܺܣܡܣͳΪеܣE=Ek+Ep Ŵ±꣩

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    ϵͳ̬ܻеE1ĩ̬ܻеE2E1=E2 Ŵ±꣩

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    ϵͳֻAB壬AٵĻеܵBӵĻеܣEA=EBűʾ±꣩

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