什么叫物体的黑度?
参考答案:
一切实际物体的辐射击力总小于同温度下黑体的辐射力,我们把某一物体的辐射力E与同温度下黑体的辐射力Eo之比称为该物体的"黑度".
As a good teacher, he should use different ways to encourage all children to realize their full and achieve their goals.
A.possibility
B.conception
C.potential
D.difference
继发性三叉神经痛和原发性三叉神经痛有何区别?