A:向右下方移、有丝分裂后期
B:向左上方移、减数第一次分裂期
C:向右下方移、减数第二次分裂期
D:向左上方移、有丝分裂末期
某高中物理课程基地拟采购一批实验器材,增强学生对电偏转和磁偏转研究的动手能力,其核心结构原理可简化为题图所示.AB、CD间的区域有竖直向上的匀强电场,在CD的右侧有一与CD相切于M点的圆形有界匀强磁场,磁场方向垂直于纸面.一带正电粒子自O点以水平初速度v0正对P点进入该电场后,从M点飞离CD边界,再经磁场偏转后又从N点垂直于CD边界回到电场区域,并恰能返回O点.已知OP间距离为d,粒子质量为m,电荷量为q,电场强度大小 E=3mv02qd ,粒子重力不计.试求:
( A )
Report Card
Name: James Smith
Time: January 24th, 2015
Subjects
Grades
Comments(评语)
English
B+
Your reading and writing are good. But you have a strong accent(口音), so you are not good at speaking. And you do not put much effort into this subject. If you work hard, you can get a better grade in this subject.
Physics
A+
You are good at this subject. You are hardworking. I am glad that you do best in this subject.
Math
C
You like this subject. But you are not good at this subject because you are a little lazy. It is disappointing.You can do better if you try your best.
Music
B
It is a happy thing to hear you play the piano. You are crazy about music. Although you like this subject best, your accent has a bad influence on your singing.
阅读以上成绩单,根据表格内容完成以下问题