I've got the message from Mr. Wang that what he has settled down in Canada.
去掉what
如图,四边形OABC是菱形,若OA=2,∠AOC=45°,则B点的坐标是 ( )
如图所示:AB∥CD,MN交CD于点E,交AB于F,BE⊥MN于点E,若∠DEM=55°,则∠ABE=( )