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已知⊙O1和⊙O2内切,它们的半径分别为2cm和5cm,则O1O2的长为( ) ...
已知⊙O1和⊙O2内切,它们的半径分别为2cm和5cm,则O1O2的长为( )
A.2cm
B.3cm
C.5cm
D.7cm
考点分析:
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