问题
填空题
pause
| 单词拼写。 |
| 1.He came to a p in reading and then went on reading. 2.How was it that she could t_____such noise? 3.Heavy rain p the possibility of continuing the game. 4.A wage rise of 5% represents an a increase of 250 for the lowest paid workers. 5.Hong Kong is very proud and p to host her significant event. 6.Next Tuesday is the (截止日期) for sending in your application. 7.As a leader,it’s wrong to (滥用) the power at any time. .The robbers tried to (抢劫) me of the bike but a policeman saved me. 9.The doctor told her to watch out for (症状) of measles . 10.We should have (预见) this trouble months ago and made provisions for it. |
答案
1.pause 2.tolerate 3.prohibited 4.annual 5.privileged 6.deadline 7.abuse 8.rob
9. symptoms 10.foreseen
中存在有界的匀强聚焦磁场，方向垂直坐标平面向外，磁场边界PQ直线与x轴平行，距x轴的距离为
，边界POQ的曲线方程为
。且方程对称y轴，在坐标x轴上A处有一粒子源，向着不同方向射出大量质量均为m、电量均为q的带正电粒子，所有粒子的初速度大小相同均为v，粒子通过有界的匀强磁场后都会聚焦在x轴上的F点．已知A点坐标为（－a，0），F点坐标为（a，0）．不计粒子所受重力和相互作用求：