[img src="https://img.haodaxue.net/uploadimg/image/20200606/20200606170715_42483.png" alt="" />
A.30°
B.45 °
C.60 °
D.120°
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正确答案: A 答案分析:img src="https://img.haodaxue.net/uploadimg/image/20200606/20200606170810_56764.png" alt="" />
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