Polycarbonate Diols (PCD) are used for a wide range of polyurethane-based coating formulations, providing an extreme durability and a high performance to the final polymer. ok
In mathematics, a reciprocity law is a generalization of the law of quadratic reciprocity. There are several different ways to express reciprocity laws.
Reciprocity of liking (also known as reciprocity of attraction and reciprocal liking) describes the tendency for individuals to think positively of others who express positive regard for them.