黑变病的发生和下列哪些有关()
A.与缺乏维生素有关
B.与焦油接触有关
C.是一种光敏性皮炎
D.可累及上胸和臂部
参考答案:A, B, C, D
6.Washing machines made by China have won worldwide attention and Haier has become popular name.
A.a; the
B./; a
C./; the
D.the; a
缓激肽()
A.调理素缺乏
B.脱颗粒障碍
C.H2O2产生障碍
D.B淋巴细胞缺陷
E.T淋巴细胞缺陷