用于鉴定转化子细胞是否含重组DNA的最常用方法是( )。
A.抗药性选择 B.分子杂交选择 C.RNA逆转录 D.免疫学方法E.体外翻译
参考答案:A
_____ in the mountains for a week,the two studentswere finally saved by the local police. [ ]
A. Having lost
B. Lost
C. Being lost
D. Losing
变电站工程施工项目经理部办公和生活临建房屋,宜设置在()