A:比较8与2的线粒体DNA序列
B:比较8与3的线粒体DNA序列
C:比较8与5的Y染色体DNA序列
D:比较8与2的X染色体DNA序列
— Why was Professor Zhang unhappy recently?
— Because the theory he insisted on _____ wrong.
已知变量x,y满足约束条件y+x-1≤0y-3x-1≤0y-x+1≥0则z=2x+y的最大值为 ( )