如图所示,平行板电容器与电源相连,下极板接地.一带电油滴位于两极板的中心P点且恰好处于静止状态,现将平行板电容器两极板在纸面内绕O、O′迅速顺时针转过45°,则 ( ) A.P点处的电势不变 B.带电油滴仍将保持静止状态 C.带电油滴将水平向右做匀加速直线运动 D.带电油滴到达极板前具有的电势能不断增加听句子,判断下列句子与所听内容是(T)否(F)相符。( ) 1. How many story-books do you have?( ) 2. We have fifty-three pencils.( ) 3. I can see thirty-six lamps.( ) 4. My schoolbag is yellow and blue.( ) 5. Is this your notebook?