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【单选题】
若用金属沉淀pI值为6的蛋白质,则此蛋白质所处的溶液pH值为A.
6
B.
〉6
C.
〈6
D.
≤6
E.
≥6
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反馈参考答案：
举一反三
【单选题】With more and more farmers moving to cities, an inadequate labor force is becoming a major factor affecting the country's grain output.
A.
automatically
B.
occasionally
C.
absolutely
D.
gradually
【单选题】I can't say which type of tea tastes better. It's just a (an) _____ of personal preference. [ ]
A.
affair
B.
problem
C.
variety
D.
matter
【单选题】Which of the following can be external negative factor?
A.
Toxic mental state
B.
Lack of vigilance
C.
Negative friends
D.
Adoption of friend's thought
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