同一个圆中的周长是直径的______倍,即:C=______或C=______.
同一个圆中的周长是直径的π倍,即:C=πd或C=2πr.
故答案为:π,πd,2πr.
将十进制数26转换成二进制数是( )。
A.01011B
B.11010B
C.11100B
D.10011B
Mike was usually so careful, ______this time he made a small mistake.
A.yet
B.still
C.even
D.thus