单项选择题
A.0% B.10%~30% C.30%~50% D.50%~70%
A.50%~60% B.60%~70% C.70%~80% D.80%~90%
A.发生于病情活动期 B.呈弥漫性休止期秃发 C.前额头发变细,无光泽,具毛刷样外观 D.可形成瘢痕导致永久性秃发