题目

7、如图所示，固定在Q点的正点电荷的电场中有M、N两点，已知＜。下列叙述正确的是 A.若把一正的点电荷从M点沿直线移到N点，则电场力对该电荷做功，电势能减少 B.若把一正的点电荷从M点沿直线移到N点，则该电荷克服电场力做功，电势能增加C.若把一负的点电荷从M点沿直线移到N点，则电场力对该电荷做功，电势能减少D.若把一负的点电荷从M点沿直线移到N点，再从N点沿不同路径移回到M点，则该电荷克服电场力做的功等于电场力对该电荷所做的动，2.情景问答匹配。() (1) Happy Father's Day,Dad!() (2) What do people usually eat at this festival? ^() (3) What is it?() (4) When is your birthday?() (5 ) Is Halloween on 31 st October?   A. My birthday is on the third of June.   B. Thank you.   C. Yes,it is.   D. It is a festival for old people.   E. They usually eat moon cakes.   F. They usually visit their parents.