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O1,O2分别为⊿ABC和⊿A1B1C1的外心,且⊿ABC-t(a)⊿A1B1C1,则O1O2=()

单选题
2021-09-01 16:00
A、AB
B、AC
C、BC
D、∣a∣
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正确答案
D

试题解析

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