题目

/>①海沟 ②褶皱山脉 ③裂谷 ④岛孤和海岸山脉A．①③B．②④C．③④D．①④There was a boy who was sent by his parents to a boarding school  (寄宿学校). 1   being sent away, this boy was the   2 student in his class. He was at the top in every  3  always with high marks. But the boy changed after   4 home and attending the boarding school. His grades started    5  . He hated being in a   6 . He was lonely all the time. And there were especially dark times when he   7  committing suicide  (自杀). All of this was because he felt �如图所示,在某空间实验室中,有两个靠在一起的等大的圆柱形区域,分别存在着等大反向的匀强磁场,磁感应强度B=0.10 T,磁场区域半径r= m,左侧区圆心为O1,磁场向里,右侧区圆心为O2,磁场向外,两区域切点为C.今有质量m=3.2×10-26  kg、带电荷量q=1.6×10-19  C的某种离子,从左侧区边缘的A点以速度v=106  m/s正对O1的方向垂直射入磁场,它将穿越C点后再从右侧区穿出.求: 1.该离子通过两磁场区域所用的时间. 2.离子离开右侧区域的出射点偏离最初入射方向的侧移距离多大?（侧移距离指垂直初速度方向上移动的距离）.