The manufacturer sells it, the buyer does not use it, and the user does not see it. What is it?
Inconspicuous gift. A certain product produced by the manufacturer is given by the buyer, which is not in the eyes of the recipient and is abandoned in the…
wood grade mark?
According to the national standards, all kinds of commercial timber are classified according to their defects, which are usually divided into one, two, three and four grades. Generally,…