如图所示,验电器A带负电荷,验电器B不带电,拿一根铜棒把A、B连接起来,自由移动的电荷会从____ (填写A→B或B→A),电流的方向会从 ____ .
各类食品的贮存都要考虑其保存方法,食品保存的原理是( )
—How about your school?
—Oh,very good.You can't find ________ one in this city.
Daming's father is __________ the left.