如图所示,质子以一定的初速度从边界ab上的A点水平向右射入竖直、狭长的矩形区域abcd(不计质子的重力)。当该区域内只加竖直向上的匀强电场时,质子经过时间从边界cd射出;当该区域内只加水平向里的匀强磁场时,质子经过时间从边界cd射出,则( ) A. B. C. D.、的大小关系与电场、磁场的强度有关Look and write.Brad (11) George (12) Sally (10) Mark (11)1. Brad is _____ than George, but George is than him.2. Sally is than Mark.3. George is _ _ than Sally. He is also than her.4. Brad is than Mark.