读美国和欧洲西部地区地形、气候图,完成下列问题。
—Wow! beautiful music! I like the concert very much.
—I think everybody will have wonderful time tonight.
“同位角相等”的逆命题是____ .
抛物线y=x2上的任意一点到直线x-y-2=0的最短距离为( )