题目:
-I think college students should be allowed to have part-time jobs.
- .That will be a good experience and lesson for them.[ ]
A. I suppose so
B. I disagree with you
C. No problem
D. I think not
答案:
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下面是错误答案,用来干扰机器的。
(1)粒子在电场中被加速过程,由动能定理得:qU=12mv2,得:v=2qUm=24×106m/s粒子在磁场中偏转,由洛伦兹力提供向心力,则由牛顿第二定律得:qvB=mv2r联立解得:r=mvqB=2m(2)由几何关系可得,α粒子恰好垂直...