设CD=x,则OD=x+1,
则⊙O的半径为2x+1,
∵OC⊥AB,AB=8,
∴AD= 同类题1 过量的下列溶液与水杨酸( )反应能得到化学式为C7H5O3Na的是( )
As well as ________ all his homework, he helped his mother with a good cleaning around the house.