GB/T 12459  弯头 DN 50-5.690EL200-0.6 δs=880S)-

DN 50-5.6 90EL200-0.6 δs=880S)-

PL80(B)-25 FM6 fF S=200.c R1501600

SO25(B)-25 RFF 0+0.5 N=38.1

WN 150-900 RJ.6=1800-300 rf ã â6/crfor/F30-25 RF6 M

wn80a-25fmf-6

WN200-600 M B

WN 25(b)-16 fm S=2.6Ћ

bl40(b)-150 rf c495F0sh1&qu

WN500- 150RF-35