GB/T 12459  同心异径管 DN 300×150-Ⅱ-Sch80RCM bb=70/

DN 300×150-Ⅱ-Sch80 RCM bb=70/

wn600b-16ff s=8=

BL400(B)-6 RF5 & b=48G»1.RF6RF.se

PL40-25 RFELRF-30 B1HGfS S=6=50 RASCH

SO80(B)-10 RF25F

WN 40-300 ff25FF100-150

so32-16m0=57.F16 RF RFFFRF

wn20-900 rfsch160

5 CM 1800-6.4RF=8f20δ0=60S=18.26

WN600-1