如图,⊙O是△ABC的内切圆,切点分别是D、E、F,已知∠A=100°,∠C=30°,则∠DFE的度数是( )
A:55°
B:60°
C:65°
D:70°
所有的整数都比小数大
—Are you familiar with the music?
— Yes. There was a time _____ this kind of music was quite popular.
PA垂直于以AB为直径的圆所在的平面,C为圆上异于A、B的任一点,则下列关系不正确的是.