溶度积和溶解度都可以表示难溶电解质在水中溶解能力。( )
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缓冲溶液中,大量存在未离解的弱酸(弱碱)分子及其盐的离子。因此有缓冲作用。()
A. 对
B. 错
[音频]1.
A) It’s wonderful.
B) Sorry to hear it.
C) That’s all right.
D) It’s over there.
2
A) Here you are.
B)Yes, of course.
C)It doesn’t matter.
D) Thank you.
3
A) You are right.
B)Here is my card.
C) It’s great.
D)How are you?