如图是由若干个小正方形搭建的几何体的三视图,那么此几何体由____ 个小正方形搭建而成.
His methods are regarded as the of working by his leaders and workmates.
如图所示,要使流过灵敏电流计的电流反向,下列措施中可行的是 ( )
① 只将磁场反向② 只将线圈的运动方向反向③ 同时将磁场和线圈的运动方向反向④ 增加磁铁的磁性或线圈匝数
____ the ____ ____ in Beijing?