气相色区分析中利用保留值定性应注意哪些问题? 发布时间:2019-02-03 21:26 │ 来源:www.tikuol.com 题型:问答题 简答题 问题: 气相色区分析中利用保留值定性应注意哪些问题?
题型:问答题 简答题 把画线部分发音与其他三个不同的一项选出来。 ( ) 1. A. baby ( ) 2. A. leave ( ) 3. A. soon ( ) 4. A. begin ( ) 5. A. classes B. late B. teach B. cook B. often B. glassC. make C. speak C. food C. ago C. buses D. factory D. great D. room D. uncle D. houses 查看答案
题型:问答题 简答题 I have been looking for this book for months, and ____ I have found it. [ ]A. at least B. in no time C. at last D. at present 查看答案