A:(-∞,0
B:1,+∞)
C:(-∞,0∪1,+∞)
D:(-∞,-1∪0,+∞)
A number of new functions ________ to the computer since it was first invented in 1946.
If you want to lose weight, you'd better not eat too much meat.
在⊙O中,r=13,弦AB=24,则圆心O到AB的距离为( )