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【单选题】
蛋白质的等电点指的是A.
蛋白质溶液的pH等于7时溶液的pH
B.
蛋白质溶液的pH等于7.4时溶液的pH
C.
蛋白质分子呈负离子状态时溶液的pH
D.
蛋白质分子呈正离子状态时溶液的pH
E.
蛋白质的正电荷与负电荷相等时溶液的pH
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【单选题】Studying the diverse wisdom of others can ________.
A.
create varying artistic interests
B.
help people see things in their right perspective
C.
help improve connections among people
D.
regulate the behavior. of modern people
【单选题】600-nm light falls on a single-slit (width a=0.3mm), the screen is 2.0m away. At diffraction angle θ=0.005rad, which fringe can be observed?
A.
The first bright fringe.
B.
The second bright fringe.
C.
The first dark fringe.
D.
The second dark fringe.
【简答题】According to the passage, we can infer that______. [A] language has nothing to do with interpreting [B] only those postgraduates from the foreign language universities can work as interpreters [C] int...
【简答题】阅读以下关于电子商务系统建设方面的叙述，在回答问题1至问题3。 电子商务是构建在Internet上的新商务模式。企业和个人使用电子商务来降低交易成本，提高商品和信息流的周转速度，提高客户服务水平，并且使得制造商、供应商和客户之间可以紧密合作。企业信息化是实施企业电子商务的基础，特别是在企业流程再造、供应链管理、客户关系管理等方面需要依托信息技术进行整合和优化。 一个完整的电子商务系统必须处理销售生...
【单选题】There are stations where runners can get water at ________ throughout the marathon. [ ]
A.
gaps
B.
intervals
C.
random
D.
distance
【单选题】According to the passage, we can infer that
A.
language has nothing to do with interpreting
B.
only those postgraduates from the foreign language universities can work as interpreters
C.
interpreters must live in the country where the required language is spoken
D.
interpreters build the bridge for international communication
【简答题】A．blink B．brink C．edge D．fringe
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