DNA重组的步骤包括A.将重组DNA导入受体细胞 B.将外源DNA与载体连接 C.培 发布时间:2017-06-13 07:07 │ 来源:www.tikuol.com 题型:多项选择题 问题: DNA重组的步骤包括A.将重组DNA导入受体细胞B.将外源DNA与载体连接C.培养细胞以扩增重组DNAD.选出含有重组体的克隆
题型:多项选择题 —May I speak to Mr. Green? —Sorry, he _____ to Beijing. He hasn't been back yet. [ ]A. goes B. has been C. has gone 查看答案