【简答题】已知:如图①,在平行四边形ABCD中,AB=12,BC=6,AD⊥BD.以AD为斜边在平行四边形ABCD的内部作Rt△AED,∠EAD=30°,∠AED=90°. (1)求△AED的周长; (2)若△AED以每秒2个单位长度的速度沿DC向右平行移动,得到△A 0 E 0 D 0 ,当A 0 D 0 与BC重合时停止移动,设运动时间为t秒,△A 0 E 0 D 0 与△BDC重叠的面积为S,请直接写...
【单选题】听力原文: President Chirac of France has attacked bilateral trade deals which he said could undermine internationally agreed measures that allow poor countries to produce cheap copies of anti-AIDS drugs. ...