A.2.77m,1→2 B.3.77m,2→1 C.2.77m,2→1 D

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问题 A.2.77m,1→2B.3.77m,2→1C.2.77m,2→1D.3.77m,1→2

选项 A.2.77m,1→2
B.3.77m,2→1
C.2.77m,2→1
D.3.77m,1→2

答案 A

解析
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