A:m|m=0,m≥1
B:m|m=0,m>1
C:m|m≥1
D:m|m=0
如图是四种生物的结构示意图,有关叙述错误的是( )
如图,⊙O的直径CD=20,AB是⊙O的弦,AB⊥CD于M,OM:OD=3:5.则AB的长是( )
I didn't hear the phone. I ______ asleep.