单项选择题
A.红斑狼疮 B.类风湿性关节炎 C.结节性多动脉炎 D.过敏性紫癜
A.30%~50% B.50%~70% C.70%~90% D.90%以上
A.5%~15% B.15%~25% C.25%~3s% D.35%~45%