As the chromophore relaxes, the twist of the C15 methine bridge about its two dihedralangles is reversed.
当发光基团松弛，C15次甲基桥的两个二面角的扭曲是相反的。
2
In the form of propositions, this paper discusses several solution methods of the size of dihedralangles and proof and example are also offered.
本文以命题形式讨论无棱二面角的平面角大小的几种解法并加以证明和举例。
3
In this paper, some relations of the invariants concerning the simplex and its tangent point simplex, are given and then, an inequality for the dihedralangles of a simplex is also presented.