A.100°~120° B.120°~125° C.130°~140° D.140°~160° E.150°~170° 恒牙列期下颌角为

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问题 A.100°~120°
B.120°~125°
C.130°~140°
D.140°~160°
E.150°~170°
恒牙列期下颌角为

选项 A、 
B、 
C、 
D、 
E、 

答案B

解析
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