Considering its colourable and castable nature, its extended hardness range, low wear and superior load bearing capacity, polyurethane is a smart substitute for rubber. 考虑到着色和浇铸料的性质,选择具有更大硬度范围,低磨损,优越承载能力的聚氨酯替代橡胶是明智的。
On the Total-Colourable Critical Graph 全着色临界图
A problem on uniquely k& colourable graph k&唯一可着色图的一个问题
A ( Q) Type Planar Graph and Its 4 Colourable A(Q)类平面图及其可4&着色的证明
A class of uniquely n& colourable graphs 一类唯一n可着色图