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Abstract:Flips in triangulations of convex polygons arise in many different settings. They are isomorphic to rotations in binary trees, define edges in the 1-skeleton of the Associahedron and cover relations in the Tamari Lattice.
上海钢联分析师饶文博认为，钨价短期内易涨难跌。长期来看，资源枯竭与需求扩张的剪刀差难以逆转，钨价或将长期上行。国金证券表示，在海外加大战略备库的背景下，钨的优先级较高。结合目前供需格局，继续看多钨板块。国元证券称，供给约束和乐观的战略金属价值预期仍为行情提供坚实基础。在目前总体谨慎偏乐观的心态下，钨原料市场或保持货紧价俏态势。，更多细节参见纸飞机官网