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【单选题】
经15N同位素标记的一段双链DNA片段在14N培养液经n代后,含纯14N的双链DNA有( )
A.
2 n+1
B.
2 n-1
C.
2 n-2
D.
2 n
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举一反三
【单选题】Twenty-five students wererandomly selected from each ethnic group.
A.
problem
B.
research questions
C.
hypothesis
D.
procedure
E.
findings
F.
conclusion
【单选题】—How about going out for a picnic on Sunday morning? —Hmm.___.The weather is very good these days.
A.
Yes, why not
B.
Well, no way
C.
Oh, never mind
D.
Sure, no matter
【单选题】Twenty-five students wererandomly selected from each ethnic group.
A.
P -- Problem
B.
Q -- research questions
C.
H -- hypothesis
D.
PR -- procedure
E.
F -- findings
F.
C -- Conclusion
【简答题】( )是仿生形态最基本、最微观的部分。是对生物体和自然界物质存在的内部结构原理的模仿。
【简答题】完形填空。 In some areas of the world the weather is very 1_____ and this fact plays an important part in the daily lives of the people. 2_____ they are farmers, fishermen, or sailors, for instance, they 3...
【简答题】微血管病性溶血性贫血的发病机制主要与下列哪项因素有关? A.微血管内皮细胞大量受损 B.纤维蛋白丝在微血管腔内形成细网 C.血小板的损伤 D.小血管内血流淤滞 E.白细胞的破坏作用
【判断题】the weather is very bad today.
A.
正确
B.
错误
【单选题】Now_____is late autumn and the weather is very cool.
A.
that
B.
it
C.
this
D.
one
【单选题】微血管病性溶血性贫血的发病机制( )
A.
微血管内皮细胞大量受损
B.
小血管强烈收缩
C.
小血管内流血淤滞
D.
微血管内大量微血栓形成
E.
纤维蛋白丝在微血管腔内形成
【单选题】–The weather is very cold these days.        – .
A.
So do I                
B.
So is it                 
C.
So it is
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