Our hometown ____(位于) between the mountain and the lake.
已知等比数列an的首项a1=1公比q=2,则log2a1+log2a2+…+log2a11=( )
已知⊙O1和⊙O2的半径分别为4和5,且O1O2=8,则这两个圆的位置关系是( )