问题
选择题
| If you work hard, I'm sure that your dream will . |
A. come out B. come true C. come over D. come on |
答案
答案：B
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| If you work hard, I'm sure that your dream will . |
A. come out B. come true C. come over D. come on |
答案：B
圆弧．一个质量为m，电荷量为-q的带电小球，从A点正上方高为H处由静止释放，并从A点沿切线进入半圆轨道．不计空气阻力及一切能量损失，关于带电小球的运动情况，下列说法正确的是( )
mg，且H大于R时，小球能从B点离开且上升的高度为