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若⊙O1:x2+y2=5与⊙O2:(x-m)2+y2=20(m∈R)相交于A、B...
若⊙O1:x2+y2=5与⊙O2:(x-m)2+y2=20(m∈R)相交于A、B两点,且两圆在点A处的切线互相垂直,则线段AB的长度是
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C.
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D.
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