A:{﹣2,2}
B:{0,2}
C:{2}
D:{0,﹣2,2}
学习物理时,经常要进行估测,下列数值最接近实际情况的是:
一 TV says there will be a storm tomorrow.
一 ______. I planned to go climbing with my classmates.
如图,AB是⊙O的直径,弦CD⊥AB,垂足为E,若AE=2,CD=8,则⊙O的半径为( )