如图，AB是⊙O的直径，CD为弦，CD⊥AB且相交于点E，则下列结论中不成立的是_刷题宝

题干

如图，AB是⊙O的直径，CD为弦，CD⊥AB且相交于点E，则下列结论中不成立的是（　　）

A：∠A=∠D

B：=

C：∠ACB=90°

D：∠COB=3∠D

上一题下一题 0.0难度选择题更新时间:2018-02-26 03:04:54

答案(点此获取答案解析）

D

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