问题
选择题
| — Mom, I'm so tired. I can't walk any further. — _____, my dear. You can make it. |
A. Come on B. No worry C. That's impossible D. No problem |
答案
答案：A
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| — Mom, I'm so tired. I can't walk any further. — _____, my dear. You can make it. |
A. Come on B. No worry C. That's impossible D. No problem |
答案：A
，方向水平向右的匀强电场。当粒子到达B点时，速度大小仍为v，但方向变为水平，（重力加速度为g）求