题目

根据所给汉语提示完成下列句子。 (1) 他是固执的,不会改变主意的。 He is stubborn, and he won't . (2) 他学习很认真,成功地获得奖学金。 He worked hard, and succeeded . (3) 不要打搅他了。他烦心事够多了。 Don't bother him. He has a lot . (4) 我希望成为这个队的领导。 I hope that I can become . (5) 如果你永不放弃,你能做好任何事情。You can do anything well if you never .已知:如图,△ABC中,∠BAC=90°,AB是半圆O直径,半圆O交BC于D,以CD为直径作半圆O1,半圆O1交半圆O于另一点E,连结DE交AC于F.若AB=6cm,AC=8cm,求AF的长.             
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