问题
选择题
| I have a lot of readings _____ before the end of this term. |
A. completing B. to complete C. completed D. being completed |
答案
答案：B
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| I have a lot of readings _____ before the end of this term. |
A. completing B. to complete C. completed D. being completed |
答案：B
式中的Q就是产生电场的点电荷所带电荷量
，式中Q就是产生电场的点电荷所带电荷量
，与是否真空无关