A:No, it isn't
B:Yes, there is.
C:No, there aren't.
已知函数fx=x+1,x≤0log2xx>0,则函数y=ffx+1的零点个数是( )
刚出锅的汤很烫,我们用嘴对着汤吹气,汤很快就凉了。这是为什么?