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2 ��ˇ��̼��f��

2.1 ��β��r

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2.2 ��ˇ��̈D(Ҋ�D1)

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3 ��ˇҪ�c(di��n)

3.1 ��,��Ó��܅��(sh��)�_��

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3.2 ��O(sh��)Ӌ(j��)

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3.3 ��Ч��

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4 ��\(y��n)��Ч��

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