问题
选择题
| —Can you make sure ______? —Sorry, I can't. But I saw her just now. |
A. where did she go B. where she had gone C. where she has gone D. where will she go |
答案
答案：C
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| —Can you make sure ______? —Sorry, I can't. But I saw her just now. |
A. where did she go B. where she had gone C. where she has gone D. where will she go |
答案：C
的正点电荷在D点的电势能为
的正点电荷从E点移到F点，电场力做的功为
的负点电荷从F点移到A点，电荷的电势能减少