针叶类的树
发表于 2025-4-1 02:12:42
Amino Resins,ble of technical utilization’. From this early beginning the use of amino resins has grown to such an extent that in 1990 production in the USA of urea and melamine resins was 654 000 tonnes 74 Percent being for binding fibrous and granulated wood, with paint being the second-largest user.