某人失聪,经检查,医生认为耳的结构没有受损伤,那可能的受损部位是( )
A:内耳
B:鼓膜
C:中耳
D:听觉神经或听觉中枢
—I think it's important to________local businesses by buying locally.
—I agree with you.
(Ⅰ)证明:AN∥平面MBD;
(Ⅱ)求三棱锥N﹣MBD的体积.
如图是植物细胞和动物细胞的结构模式图,为细胞生命活动控制中心的结构是( )