Betty is an English girl. She studies in a middle school. On weekdays(非休息日) she gets up at 6:30. She has breakfast at seven. Then she goes to school on her bike(自行车). The school is near her home. She gets to school at around seven-thirty.

    Classes start at eight o'clock. She has four classes in the morning and two in the afternoon. Her favorite subject is history. She has lunch at 12:00 at school. Classes end(结束) at three-thirty. After school she usually goes to the history club and then goes home. She gets home at 5:00.

有一种运动叫蹦极，如图所示是蹦极运动的简化示意图，弹性绳一端固定在O点，另一端系住运动员，运动员从O点自由下落，A点处弹性绳自然伸直。B点是运动员受到的重力与弹性绳对运动员拉力相等的点，C点是蹦极运动员到达的最低点，运动员从O点到C点的运动过程中忽略空气阻力，则（   ）

据《李鸿章传》记载，李鸿章因为洋务被天下世俗功利之人崇拜。下列企业中，与李鸿章被崇拜有关的是（    ）

①安庆内军械所  ②江南制造总局  ③汉阳铁厂  ④轮船招商局  ⑤湖北织布局

若幂函数y=mx^α（m，α∈R）的图象经过点 $\left(8,\frac{1}{4}\right)$ ，则α= ____ ．