DVD系统中,信源编码采用()编码标准。
A.调频
B.MPEG-1
C.调频-调相
D.MPEG-2
参考答案:D
设集合P={1,2,3,4},Q={x||x|≤2,x∈R},则P∩Q等于( )
A.{1,2}
B.{3,4}
C.{1}
D.{-2,-1,0,1,2}
— ____ is your schoolbag?
— It's green.
[ ]
A. What
B. What color
C. Where
D. How