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【单选题】
如图4,∠ACB=90°,CD⊥AB,垂足为点D,下列结论错误的是( ). 图4A.
图中有3个直角三角形
B.
∠1=∠2
C.
∠1和∠B都是∠A的余角
D.
∠2=∠A
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A.
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A.
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