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【单选题】
下列关于缓冲容量的选项错误的是()A.
总浓度增大，缓冲容量增大，缓冲能力也增大
B.
弱酸与其弱碱的浓度控制在 1:1 时，其缓冲容量最小
C.
缓冲溶液的有效缓冲范围约在 pH 为 pKa+-1 的范围内
D.
缓冲体系对分析过程应没有干扰
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【简答题】A．Because the insects are the most successful creatures. B．Because the insects give birth all the time. C．Because the insects can adapt to new situations quickly. D．Because the insects were the first ...
【单选题】____________ they ____________ in the forest? Yes, they are. [ ]
A.
Do, watch insects
B.
Are, watching insects
C.
Did, watch insects
【单选题】Which of the following is not true about insects?
A.
Insects can see more colours than human beings.
B.
Insects can see ultraviolet rays which are invisible to man.
C.
All insects have their favorite colours.
D.
The world is more colorful to insects than to human beings.
【单选题】Which of the following is NOT true about insects?
A.
Insects can see more colours than human beings.
B.
Insects can see ultraviolet rays which are invisible to men.
C.
All insects have their favorite colours.
D.
The world is more colorful to insects than to human beings.
【单选题】In many countries insects are not eaten because ______.
A.
insects are very dirty
B.
insects are very ugly
C.
insects are very difficult to digest
D.
A and
【单选题】In the war, a soldier’s life is full of ________.
A.
hazards
B.
cosmetics
C.
transfusion
D.
bioterrorism
E.
disorders
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