如图所示,由两个大小不同的圆组成的图形,大约有以下几种情况:
;
所以最多有无数条对称轴.
故选:C.
It is impolite to blow your nose . [ ]
A. at the table
B. on the table
C. with the table
D. under the table
简述汽温过低的危害?