MEGADYNE聚氨酯圆带PR85NL系列型号圆带直径抗拉力强度N延伸率%***小轮径PR85NL224.7810PR85NL3310815PR85NL4419825PR85NL5529830PR85NL6642840PR85NL7757850PR85NL8875855PR85NL9995865PR85NL1010118875PR85NL1212170890PR85NL15152658120PR85NL18183818150)