A:光球层
B:色球层
C:日冕层
D:大气层之外
设全集U=R,A=x|y=2x-x2B=y|y=2x,x∈R,则CRA∩B=( )
|x﹣1|+|y+3|=0,则y﹣x﹣12的值是( )
What are the speakers talking about?