问题
多项选择题
用电位法测定水样pH时，用于校正仪器刻度的pH标准缓冲液，常用的为（）。
A.1.68（25℃）
B.4.01（25℃）
C.6.86（25℃）
D.9.18（25℃）
E.12.46（25℃）
答案
参考答案：B, C, D
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用电位法测定水样pH时，用于校正仪器刻度的pH标准缓冲液，常用的为（）。
A.1.68（25℃）
B.4.01（25℃）
C.6.86（25℃）
D.9.18（25℃）
E.12.46（25℃）
参考答案：B, C, D
| 从方框中选择合适的选项补全对话，使对话意思完整、符合逻辑（有两项是多余的）。将答案答在答题处。 | |
| — What's your plan for the summer holiday? — I'll visit my cousin. __1__ — Is the farm big or small? — It's not very big, but it's really a nice one. __2__ — I'm sure you will enjoy staying there. What does he grow on the farm? — __3__ — What are you going to do there? — I'11 go there and help him pick fruit. — __4__ It sounds fun. — It really does. And the fruits are very delicious. I enjoy them very much. — Are they sold here? — Of course.__5__ My cousin will send them to other countries some day , too.
| |
| 1. _____ 2. _____ 3. _____ 4. _____ 5. _____ |