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- 3A、B是线段EF上两点,已知EA:AB:BF=1:2:3,M、N分别为EA、BF的中点,且MN=8cm,求EF的长.
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- 5I'm_____(fat)this year than last year.
- 6已知圆O中,OC垂直于弦AB于点C,AB=6,OC=4,则圆O的半径长等于?
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