问题
选择题
Was the weather nice?______,It was cold and windy every day.[ ]
A. Yes. it is
B. No, it isn't
C. Yes, it was
D. No, it wasn 't
答案
答案：D
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Was the weather nice?______,It was cold and windy every day.[ ]
A. Yes. it is
B. No, it isn't
C. Yes, it was
D. No, it wasn 't
答案：D
30℃时，NaOH溶解于水的实验数据如下表．
| 实验序号 | 水的质量（克） | 加入NaOH质量（克） | 所得溶液质量（克） |
| ① | 10 | 5 | 15 |
| ② | 10 | 10 | 20 |
| ③ | 10 | 15 | 21 |
| ④ | 10 | 20 | 21 |
（2）实验②所得的溶液是______溶液（填饱和或不饱和）．
（3）30℃时，NaOH的溶解度为______克/100克水
（4）如果在实验②中，滴加足量的硫酸铜溶液，则会生成______mol沉淀，该反应的化学方程式______．