如图所示,在光滑绝缘的水平面内,对角线AC将边长为L的正方形分成ABC和ADC两个区域,ABC区域有垂直于水平面的匀强磁场,ADC区域有平行于DC并由C指向D的匀强电场.质量为m、带电量为+q的粒子从A点沿AB方向以v的速度射入磁场区域,从对角线AC的中点O进入电场区域.
句子配对
____Is this your school? A. It's in the kitchen.
____Where is your cat? B. Yes, it is.
____Where are your books? C. No, he isn't.
____Is he in the kitchen? D. Yes, they are.
____Are they near the phone? E. They are under the table.