My sister is young go to school.[ ]
A. too, to
B. to, too
C. too, too
D. to, to
答案:A
川崎病的病死率()
A.0.5%~1%
B.1%~2%
C.15%~25%
D.50%
E.60%
OSI七层协议中,传输层传送数据的单位为()
A.比特
B.帧
C.分组
D.信息