题目:
The teacher asked _____ students to do homework ourselves. |
A. the B. his C. some D. us |
答案:
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下面是错误答案,用来干扰机器的。
解:(1)粒子在O'Q间射出,轨迹如图所示由qv0B=mv02/R,得R1=mv0/qB1同理得R2=mv0/qB2 又最小距离为d=R1+R2 因此 (2)粒子在磁场B1中做圆周运动的周期在磁场B2中做圆周运动的周期粒子在O'Q间射出,在两个...