已知角α的终边与以坐标原点为圆心，以1为半径的圆交于点P（sin$\frac{2\mathrm{\pi }}{3}$，cos$\frac{2\mathrm{\pi }}{3}$），则角α的最小正值为（　　）

阅读短文，下列问题

A

    Min Sun, with another name of Ziqian, was a famous man in the State of Lu during the Spring and Autumn Period. He was a student of Confucius. Among all students of Confucius, he was compared with Yan Yuan.

    Min Sun's mother died very early. Later his father took another wife,who gave birth to two sons. The stepmother mistreated Min Sun—in winter,while two younger brothers wore warm clothes made of cotton, Min Sun only wore clothes made of reed catkins（芦花）.

    One day, he followed his father to go out. When pulling the chariot（马车）, Min Sun felt so cold that he dropped the rope onto the ground. Then his father beat him. Just then the reed catkins flew out from the broken clothes and his father knew that Min Sun was mistreated. He was very angry.

    After the father returned home, he wanted to divorce（休掉） his wife. Min Sun fell on his knees and begged his father to forgive his stepmother. He said, “If Mother stays at home, only I myself have to stand cold.But if you divorce Mother, all three children have to suffer from cold.”

    His father was deeply moved and took Min Sun's advice. The stepmother heard of this, felt sorry and knew her mistakes. From then on, she treated Min Sun as her own son.

2012年1月10日，聊城电视台天气预报：“聊城明天天气多云转晴，北风转南风3—4级，湖面4—5级。最低气温：-6℃左右”。  11日这天学生们上学最适合的衣着是

如图甲所示，平行直线PQ，MN相距为d，内有匀强磁场，磁感应强度为B，方向垂直纸面．在苴线PQ的O点处有一粒子源，同时向各个方向均匀发射质量为m，电荷量为q，速度大小相同的粒子，重力不计，边界存在磁场，