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【单选题】
研究者在实际抽样（特别是概率抽样）时，经常是先找到一份近似涵盖所有总体元素的名单，然后抽取部分元素，这份名单被称为【】A.
抽样框
B.
抽样单元
C.
样本名单
D.
次级总体
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举一反三
【单选题】关于补体活化的MBL途径,下列哪项是错误的?
A.
激活起始于MBL与病原体结合后
B.
MBL是细菌表面成分
C.
其C3转化酶是C4b2a
D.
参与非特异性免疫,在感染的早期发挥作用
E.
MBL与C1q结构相似
【简答题】完形填空 Time is the easiest thing in the world to waste-the most difficult to control. When you look ahead, it may appear you have __ 1 __ you need. Yet it has a way of slipping __ 2 __ your fingers like...
【单选题】关于补体活化的MBL途径,下列哪项是错误的?( )
A.
激活起始于MBL与病原体结合后
B.
MBL具有酶活性
C.
其C3转化酶是C462b
D.
参与非特异性免疫,在感染的早期发挥作用
E.
C反应蛋白可激活C1q
【单选题】Identify the major function of the following dialogue speaker A: Hello! How are you? Speaker B: Hi! You loo like one of sy friends Lily. Speaker A: Oh. really?
A.
phatic function
B.
physiological function
C.
pleasure function
D.
identifying function
【单选题】关于补体活化的MBL途径,下列哪项描述是错误的
A.
激活起始于MBL
B.
MBL具有酶活性病原体的结合
C.
其C3转化酶是C4b2a
D.
参与非特异性免疫，在感染早起期发挥作用
E.
MASPI可以直接裂解C3
【单选题】The old paper mill has been _____ to make way for a new shopping centre.
A.
cut down
B.
kept down
C.
torn down
D.
held down
【简答题】用 must, oughtn't to, don't have to, mustn't, needn't或 have to填空。 1. You _____ go on working because you look so tired now. 2. The weather turned out to be fine yesterday. I ______ have had the troubl...
【简答题】比赛进行中，球击中裁判员身体后进入球门，应
【简答题】You loo k (可笑的) in those tight jeans.
【简答题】用所给词的适当形式填空。 小题1:He is really_______ (humour). He often makes us laugh. 小题2:Can you look after_______ (you) well at school, Bill? 小题3:I felt _______ (bore) to hear the same story. 小题4:She lost her new...
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