A:转基因抗虫棉的培育成功
B:将C4植物的叶绿体移入C3植物体内使光合效率提高
C:利用工程菌生产胰岛素
D:利用DNA探针检测饮用水有无病菌
两个棱长都是2厘米的正方体拼成了一个长方体: ,这个长方体的表面积是____平方厘米,体积是____立方厘米。
Look!Your sister is at the____.
等比数列{an}中,a3=6,前三项和S3=∫034xdx,则公比q的值为( )
- I don't think students should use mobile phones at school.
- ______. They really have a bad influence on our study.