引起外阴瘙痒的因素包括（）
A.外阴白癜风
B.糖尿病
C.妊娠期肝内胆汁淤积症
D.黄疸
E.精神因素
参考答案：B, C, D, E
It is ___ the customers' needs that has made chain stores so popular in big cities in China. [ ]
A. meeting
B. met
C. to have met
D. being met
设某圆锥的侧面积是10π，表面积是19π，则它的侧面展开图的圆心角是______．
