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【单选题】
蛋白印迹实验时，为尽可能保证电泳迁移速率取决于分子量的大小，需向聚丙烯酰胺凝胶中加入以下哪种成分A.
过硫酸铵 （APS）
B.
十二烷基硫酸钠 （SDS）
C.
四甲基乙二胺 （TMEDA/TEMED）
D.
乙二胺四乙酸 （EDTA）
E.
溴化乙锭（EB）
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举一反三
【单选题】I n Paras. 6 — 13, three methods of animal protection are mentioned,which of the following is not correct?
A.
Captive breeding
B.
Actions of the animal rights group of PETA
C.
Vegetarianism
D.
Wildlife conservation law
【单选题】Remember not to ____ when you enter the room.
A.
look up
B.
look round
C.
look into
D.
look through
【简答题】“When your mother scolds you, you can look elsewhere and think about other things. Just ignore her words. But remember: such a tough attitude cannot be used often.” These words are from a series of ca...
【单选题】Which one of the following statements is NOT true about the understanding of the sentence “Not once in my conversations with him have I heard him talk about any ethnic group in derogatory terms, or tr...
A.
Obama claims that he never heard Reverent Wright used words to disparage any ethnic group in the conversations with him.
B.
Obama also makes it clear that to his knowledge Reverent Wright always treat whites with politeness and respect.
C.
Obama also makes it clear that to his knowledge Reverent Wright always treat white with bad manners and disrespect.
D.
Obama tries to tell the public what Reverent Wright looks like in his eyes.
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