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【单选题】
若用重金属沉淀 pI为8的蛋白质时,该溶液的pH值A.
8
B.
B．＞8
C.
C．＜8
D.
D．≤8
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【简答题】由于 对酵母菌基本无效,所以它常用于面包的防霉,还能起到强化钙质的效果。
【单选题】Whether you are a smoker or non-smoker, you should take measures to protect your lungs. You can test your lung capacity by holding a lighted match about six inches from your face and trying to blow it...
A.
Necessity is the mother of invention.
B.
An ounce of prevention is worth a pound of cure.
C.
Don’t count your chickens before they are hatched.
D.
We don't need doctors.
【单选题】If you must enter water on which there is an oil fire, you should ______.
A.
protect your life preserver by holding it above your head
B.
enter the water on the windward side of the vessel
C.
keep both hands in front of your face to break the water surface when diving head first
D.
wear very light clothing
【简答题】Let us suppose that you are in the position of a parent. Would you allow your children to read any book they wanted to without first checking its contents? Would you take your children to see any film...
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