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【单选题】
欲配制pH=7的缓冲溶液,下列物质的共轭酸碱对中最好的是A.
羟氨 Kb= 1.0×10 - 9
B.
NH 3 ·H 2 O Kb=1.8×10 - 5
C.
NaH 2 PO 4 K 2 =6.2×10 - 8
D.
甲酸 Ka=1.0×10 - 4
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【简答题】底妆产品包括什么?
【单选题】Why do scientists worry if a human clone would be healthy?
A.
Because cloned animals are deformed.
B.
Because cloned animals can't produce offspring.
C.
Because cloned animals will have miscarriages.
D.
Because cloned animals might show health problems as they age.
【单选题】对于“降低学力水准”教学的看法,错误的是( )
A.
它是一种“伪善的平等主义”
B.
会导致“平庸教育”
C.
保证了教育的整体质量
D.
虽适应了差生的需要，但却使大多数中等学生和一部分优等生感到学习厌倦、缺乏挑战性
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A.
3.12
B.
2.7
C.
3.5
D.
2. 44
【单选题】why would one have a sense of confinement in the Rainy Mountain?
A.
because there are canyons, waterfalls, lakes and timbers.
B.
because there was only wilderness and no civilization.
C.
because it is a world for animals, not for human beings.
D.
because one cannot be free in the shadow and shades.
【单选题】Why would one have a sense of confinement in the Rainy Mountain?
A.
Because there are canyons, waterfalls, lakes and timbers.
B.
Because there was only wilderness and no civilization.
C.
Because it is a world for animals, not for human beings.
D.
Because one cannot be free in the shadow and shades.
【单选题】Q3. Why do scientists worry if a human clone would be healthy?
A.
Because cloned animals are deformed.
B.
Because cloned animals can't produce offspring.
C.
Because cloned animals will have miscarriages.
D.
Because cloned animals might show health problems as they age.
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