△ABC中,∠C=90°,CD是AB上的中线,CE是AB上的高,下列判断正确的有( )
①∠B=∠1; ②∠1=∠3; ③∠2=∠3; ④∠A+∠B=90°
![](https://img.xkw.com/dksih/QBM/2020/1/1/2367798095462400/2368409927417856/STEM/4161d985b5ab403e9e2b29b0889cfc01.png?resizew=166)
①∠B=∠1; ②∠1=∠3; ③∠2=∠3; ④∠A+∠B=90°
![](https://img.xkw.com/dksih/QBM/2020/1/1/2367798095462400/2368409927417856/STEM/4161d985b5ab403e9e2b29b0889cfc01.png?resizew=166)
A.①②④ | B.①③④ | C.①②③ | D.②③④ |
更新时间:2020-01-11 03:41:09
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【知识点】 直角三角形的两个锐角互余解读
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