点P是圆（x﹣6）2+（y﹣4）2=4上的动点，O为原点，求OP中点Q的轨迹参数方程．
解：∵圆（x﹣6）2+（y﹣4）2=4的参数方程为 x=6+2cosθ<
下列省级行政区的行政中心配对正确的是（ ）
给问句选出合适的答句。
①Where did you go over the winter holiday? ____
②How did you go there? ____
③How was the beach? ____
④What did you do yesterday? ____
⑤Can I see your pictures? ____
A. It was beautiful.
B.I went swimming.
C. I went to Sanya.
D. Sure.
E. We went there by plane.
在如图所示的电器中，工作时将电能全部转化为内能的是（ ）
