A:to persuade out of
B:persuading out of
C:being persuaded into
D:be persuaded into
如图,△ABC中,∠A=40°,∠B=76°,CE平分∠ACB,CD⊥AB于点D,DF⊥CE于点F,求∠CDF的度数.
由直线x=0,x=2π3,y=0与曲线y=2sinx所围成的图形的面积等于( )
被誉为杂交水稻之父的是( )