B-20#?????ˉ?????%??????ˉ??=GB3087-2008???????ˉ??????
20#?????ˉ?????-??????ˉ????????:??57-133mm
?????ˉ??57*3-3.5-4-4.5-5-6-8-10???GB3087-2008
?????ˉ??63.5*3-3.5-4-4.5-5-6-8-10???GB3087-2008
?????ˉ??68*3-3.5-4-4.5-5-6-8-10???GB3087-2008
?????ˉ??70*3.5-4-4.5-5-6-8-10-12-14???GB3087-2008
?????ˉ??73*3.5-4-4.5-5-6-8-10-12-14???GB3087-2008
?????ˉ??76*3.5-4-4.5-5-6-8-10-12-14???GB3087-2008
?????ˉ??89*3.5-4-4.5-5-6-8-10-12-14???GB3087-2008
?????ˉ??102*4.5-5-6-8-10-12-14-16-18-20???GB3087-2008
?????ˉ??108*4.5-5-6-8-10-12-14-16-18-20???GB3087-2008
?????ˉ??114*4.5-5-6-8-10-12-14-16-18-20???GB3087-2008
?????ˉ??121*4.5-5-6-8-10-12-14-16-18-20???GB3087-2008
?????ˉ??133*4.5-5-6-8-10-12-14-16-18-20???GB3087-2008
GB3087-2008???????ˉ??????:????????????????????,??????綽:0510-88268136
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