A:-37
B:-29
C:-5
D:以上都不对
如图,在⊙O中,AC与BD是圆的直径,BE⊥AC,CF⊥BD,垂足分别为E、F
(1)四边形ABCD是什么特殊的四边形?请判断并说明理由;
(2)求证:BE=CF.
It is ____(possible)for me to do too many things in two days. Can you help me?