A.F1=F2=F3 B.F1=F2≠F3 C.F1≠F2=F3 D.F1

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问题 A.F1=F2=F3B.F1=F2≠F3C.F1≠F2=F3D.F1≠F2≠F3

选项 A.F1=F2=F3
B.F1=F2≠F3
C.F1≠F2=F3
D.F1≠F2≠F3

答案 A

解析
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