制备组织细胞抗原时,所用的组织必须()
A.新鲜或低温保存
B.121℃、15min灭菌
C.甲醛固定5min
D.应用蒸馏水灌注以清洗血液及有形成分
E.25℃保存
参考答案:A
It's a great____________ for her to go to London, and she enjoyed herself there. [ ]
A. surprise
B. pleasure
C. honour
D. treat
诊断是
A.脑震荡
B.头皮裂伤
C.开放凹陷性颅骨骨折
D.闭合性凹陷性颅骨骨折
E.头皮血肿