A:Following; are
B:Following; i
C:Followed by; are
D:To follow; are
如图,⊙I为△ABC的内切圆,AB=9,BC=8,AC=10,点D、E分别为AB、AC上的点,且DE为⊙I的切线,则△ADE的周长为 ____
如图曲线反映某生理过程或现象.下列有关叙述中,不正确的是( )
下列不属于生态系统的是( )
____ ____ ____ = ____ (只)