脑脊液鼻漏时鼻内镜检查发现脑脊液来自鼻顶部,提示瘘孔在:()
A.蝶窦
B.额窦
C.筛板
D.颅中窝
E.鼓室或乳突
参考答案:C
抗原抗体沉淀反应出现前带现象是因为()
A.抗原过量
B.抗体过量
C.抗原抗体均过量
D.温度不合适
E.有共同抗原的存在
Would you please _______ the paper for me and see if there are any obvious mistakes? [ ]
A. look around
B. look into
C. look up
D. look through