n.收縮性;縮小性;伸縮力
Macromolecule materials are added into urea-formaldehyde-resin todecrease its brittleness and contractility, and increase its water-resistance. 在脲醛樹(shù)酯中加入其它高分子材料,降低其脆性和收縮性,提高其耐水性。