A . I≤0.5,0.5<I≤1.0,I>1.0B . I<0.5,0.5≤I≤1.0,I>1.0C . I≤0.5,0.5≤I<1.0,I≥1.0D . I<0.5,0.5≤I<1.0,I≥1.0
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