16.已知点PPP在圆C1:(x−2)2+y2=4{C}_{1}:(x-2)^{2}+{y}^{2}=4C1:(x−2)2+y2=4上,点QQQ在圆C2:x2+y2+2x−8y+13=0{C}_{2}:{x}^{2}+{y}^{2}+2x-8y+13=0C2:x2+y2+2x−8y+13=0上,则((( )))