全不育系
参考答案：
利用双隐性纯合系msmsrfrf可育株与纯合型MsMsrfrf不育株测交，其测交一代为全不育系Msmsrfrf。
The new law states that people ________ drive after drinking alcohol.[ ]
A. wouldn't
B. needn't
C. won't
D. mustn't
如何做好电气安装工程信息化管理？
