重症肌无力常与哪种病合并存在
A.小细胞肺癌
B.甲状腺功能亢进
C.多发性肌炎
D.胸腺肥大或胸腺瘤
E.系统性红斑狼疮
参考答案:D
He__________unwisely, but he was at least trying to do something helpful.
A.may have acted
B.must have acted
C.should act
D.would act
预防接种属于预防传染病措施中的 。