问题
单项选择题
乙酰丙酮分光光度法适用于测定游离甲醛含量大于（）的室内建筑装饰装修用胶粘剂。
A、5%
B、0.5%
C、0.05%
D、0.005%
答案
参考答案：D
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乙酰丙酮分光光度法适用于测定游离甲醛含量大于（）的室内建筑装饰装修用胶粘剂。
A、5%
B、0.5%
C、0.05%
D、0.005%
参考答案：D
| 用should/could 的适当形式填空。 |
| 1. If you want better grades , you ______________ watch TV too much. 2. I don't know how to get to the school. What ____________ I do? 3. -_____________ I use your phone? -Sure. 4. Bill ____________ play the guitar last year, but now he plays it very well. 5. We ____________ give the book to the library on time(按时). |