涤纶纱股纱20s 2 20s 3 20s 4 20s 5 20s 6 28s 2 40s 2 60s 3涤纶合股纱价格 涤纶纱股纱20s 2 20s 3 20s 4 20s 5 20s 6 28s 2 40s 2 60s