Go to the ____. Have a snack.
如图,已知四边形ABCD内接于圆,对角线AC与BD相交于点E,F在AC上,AB=AD,∠BFC=∠BAD=2∠DFC.
(1)若∠DFC=40°,求∠CBF的度数;
(2)求证:CD⊥DF.
我国动植物资源丰富,农、林、牧、副、渔各业综合发展,其主要原因是( )
Juice is ____.(填颜色)