单项选择题
我国遗传因素占错畸形的()
A.29.4%
B.91.2%
C.90%
D.50%
E.25%
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1.单项选择题固定矫治时釉质脱矿发病率为()
A.29.4%
B.91.2%
C.90%
D.50%
E.25%
2.单项选择题
口腔不良习惯占各类错畸形的()
A.29.4%
B.91.2%
C.90%
D.50%
E.25%
3.单项选择题6岁时神经系统发育达到()
A.29.4%
B.91.2%
C.90%
D.50%
E.25%
4.单项选择题
1955年毛燮均教授等以理想为标准调查统计错患病为率()
A.29.4%
B.91.2%
C.90%
D.50%
E.25%
5.单项选择题
骨性Ⅲ错ANB角为()
A.140°~160°
B.130°~140°
C.120°~125°
D.125°
E.<0°
6.单项选择题新生儿下颌角为()
A.140°~160°
B.130°~140°
C.120°~125°
D.125°
E.<0°
7.单项选择题成人下颌角为()
A.140°~160°
B.130°~140°
C.120°~125°
D.125°
E.<0°
8.单项选择题3岁时下颌角为()
A.140°~160°
B.130°~140°
C.120°~125°
D.125°
E.<0°
9.单项选择题12岁时下颌角为()
A.140°~160°
B.130°~140°
C.120°~125°
D.125°
E.<0°
10.单项选择题
由颊舌两个臂和支托组成的包绕基牙三个或四个轴面的卡环为()
A.正型卡环
B.连支卡环
C.长臂卡环
D.连续卡环
E.环形卡环