题目

如图所示, 让平行板电容器带电后，极板B与一灵敏的静电计相接，极板A接地。静电计的指针偏转一定的角度，若不改变A、B两板的带电量而将A板向B板靠近，那么静电计指针的偏转角度将A．一定减小            B．一定增大   C．一定不变            D．可能不变  答案：A解析:略      Rose told her father that she wanted a new bike.A．Nine-year-oldB．Nine-years-oldC．Nine year oldD．Nine years old