使用三脚架时,应注意每根支点与地面水平夹角应小于()。
参考答案:60度
Directions:
Study the pictures carefully and write a composition entitled The Increasing Use of Private Cars in China. Base your essay on the outline given below:
1. show your understanding of the pictures,
2. present possible reasons for the phenomenon, and
3. draw a conclusion.
You should neatly write 160—200 words on ANSWER SHEET 2.
DNA重组技术