A:the local government care
B:does the local government care
C:doesn't the local government care
D:cares the local government
如图,Rt△ABC绕O点逆时针旋转90°得Rt△BDE,其中∠ABD=∠ACB=∠BED=90°,AC=3,DE=5,则OC的长为( )
如图所示,有一固定的光滑绝缘水平平台,平台右端B与水平传送带平滑相接,传送带长L=4m.一质量为m=0.5kg、带电量为q=+2×10﹣3C的滑块放在水平平台上.平台上有一根轻质弹簧左端固定,右端与滑块接触但不连接.现将滑块从A处由静止释放,无电且传送带不动时滑块恰能到达传送带右端C点.已知弹簧始终在弹性限度内,滑块到达B点前已与弹簧完全脱离,滑块与传送带间的动摩擦因数为μ=0.20,g取l0m/s2.求:
— Do you know when he tomorrow?
— Don't worry. I think as soon as he , he will give you a call.