如图所示,水平放置的平行板电容器,上板带负电,下板带正电,断开电源,带电小球以速度v0水平射入电场,且沿下板边缘飞出.若下板不动,将上板上移一小段距离,小球仍以相同的速度v0从原处飞入,则 带电小球 ( )
The wind is blowing ______ . The windmill is moving ______ . A. strongly… slowly B. slowly….quickly C. gently … slowly
What _______ you do? I ______ smoke. A. is … can’t B. mustn’t … must C. shouldn’t … shouldn’t
What’s wrong _______ you? I have a toothache. A. with B. for C. about
______ are the polka dot slippers?80 yuan. A. How B. How much C. How many
Wild geese change homes ______ every year. A. second B. two C. twice