题目

What does the woman mean?A. She missed the travel.B. The travel was a failure.C. Bob didn,t travel with them. 答案：【答案】C【解析】M:Did you all have a good time on your visit to Paris?W: Yes, but we all missed Bob.此题为听力题，解析略。如图所示，三个质量相同，带电荷量分别为＋q、－q和0的小液滴a、b、c，从竖直放置的两板中间上方由静止释放，最后从两板间穿过，轨迹如图所示，则在穿过极板的过程中：A. 电场力对液滴a、b做的功相同B. 三者动能的增量相同C. 液滴a与液滴b电势能的变化量相等D. 重力对c做的功最多