与白斑的发生无关的是()
A.吸烟
B.自身免疫
C.维生素缺乏
D.局部刺激
E.遗传
参考答案:B
—If you like, I can do some shopping for you.
—That's a very kind . [ ]
A. offer
B. service
C. point
D. suggestion
在细菌检验中,制备血平板最常用血液采自()
A.豚鼠
B.家兔
C.绵羊
D.大白鼠
E.马