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 (social psychology) From Wikipedia, the free encyclopedia. In social psychology, reciprocity is a social rule that says people should repay, in kind, what another person has provided for them; that is, people give back (reciprocate) the kind of treatment they have received from another.