在同一个圆里.周长和直径的比是______:______.
因为圆的周长=圆周率×直径,
所以周长:直径=(圆周率×直径):直径=圆周率:1=π:1;
故答案为:π,1.
Do you like __________?[ ]
A. skate
B. skated
C. are skating
D. skating
A.5A
B.5A
C.3.5A
D.3.5A