A:0.5m
B:0.55m
C:0.6m
D:2.2m
下列有关植物生殖方式的叙述中,不正确的是( )
— Mr. Green gets up very early every morning.
— Yes, so he always goes to work ______ time.
已知实数x,y满足y≥1y≥2x-1x-y≥-2,则目标函数z=x+y的最大值为( )