It's a beautiful __ day. [ ]
A. sun
B. sunny
C. rainy
D. windy
答案:B
设集合U={x∈N|0<x≤8},S={1,2,4,5},T={3,5,7},则S∩(CUT)=[ ]
A.{1,2,4}
B.{1,2,3,4,5,7}
C.{1,2}
D.{1,2,4,5,6,8}
网关的作用是实现______的转换。