题干
After China launched a______to popularize Chinese, lots of Confucius colleges have appeared in foreign universities.(青岛市)
A：campaig
B：movement
C：measure
D：struggle
答案(点此获取答案解析）
A
上的动点，点P在y轴上的射影是M，A点坐标为
，则
的最小值是( )