问题
单项选择题
测定油类污染物时，水样如果不能当天分析可加入盐酸或硫酸使其PH值<（）以抑制微生物的生长。
A.5
B.4
C.3
D.2
答案
参考答案：D
搜题请搜索小程序“爱下问搜题”
测定油类污染物时，水样如果不能当天分析可加入盐酸或硫酸使其PH值<（）以抑制微生物的生长。
A.5
B.4
C.3
D.2
参考答案：D
| 根据对话内容，从方框的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 | |
| Mary: Good morning, Jim. Jim: Good morning, Mary. 1. Mary: Oh, it's a French book. Jim: 2. Mary: I think it could be Tony 's. 3. Jim: No, it can't be his. He has been away from school for several days. Mary: Is it Bob's? Jim: 4. You know he doesn't like French at all. Mary: Oh, I know. It must be Jane's. Look, it has her name on it. Jim: I think you are right. 5. Mary: OK. Let's go.
|