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【单选题】
如果用大肠杆菌作为宿主细胞，蛋白表达部位为细胞质，下面哪种细胞破碎的方法最佳？A.
高压匀浆法
B.
超声波法
C.
渗透压法
D.
冻融法
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举一反三
【简答题】请大家把你的家史研究上传在此哟~
【简答题】There is widespread fear among policymakers and the public today that the family is falling apart. Much of that worry stems from a basic misunderstanding of the nature of the family in the past and la...
【简答题】There is widespread fear among policymakers and the public today that the family is falling apart. Much of that worry stems from a basic misunderstanding of the nature of the family in the past and la...
【单选题】In the past, aviation industry was the smallest source of greenhouse gases emission and thus did not attract people's attention.
A.
Y
B.
N
C.
NG
【单选题】The government's policies in the past five years have shown a (n) ______ in emphasizing the necessity of improving the peasants' livelihood.
A.
exaltation
B.
coherence
C.
agony
D.
behavior
【单选题】This October, the interact celebrated its 40th birthday. In the past 40 years, this great invention has changed our lives in many ways, including our shopping habits. A big attraction. Not long ago, I...
A.
Many choices, lower prices and great convenience.
B.
The intention of following the fashion.
C.
Mom, satisfaction with the cosmetics bought on line.
D.
The curiosity about shopping online.
【单选题】It is implied in the passage that in the past______.
A.
blue-collar workers worked harder than white-collar workers
B.
white-collar workers had little difficulty getting good jobs
C.
there were more white-collar workers than blue-collar workers
D.
colleges and graduate schools trained more skilled workers than now
【简答题】每个脉冲信号使机床运动部件沿坐标轴产生一个最小位移叫[填空(1)]。
【单选题】Formed from the characters for harbor and wave, and commemorated in the 19th-century woodblock print by Hokusai that decorates so many books and articles about the subject, the word shows that these s...
A.
并列结构
B.
分裂结构
C.
倒装结构
D.
比较结构
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