A.r-=0.8227 B.r=0.8127 C.r=0.9562 D.r=0.7489 E.r=0.8331A

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问题

选项 A.r-=0.8227B.r=0.8127C.r=0.9562D.r=0.7489E.r=0.8331

答案A

解析
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