GB/T 12459  弯头 DN 40-990EL0a0-4.0/52-

DN 40-9 90EL0a0-4.0/52-

LWN 500-900 RJ B(0me16.5MM0 R

WN25-16 RfFJRF��

wn80-300rfs=4.

47065.2 A50/00

wn50(B)-10FM��77.5m47023 rf1000-1.0 δ=60 h

WN25(B)-63FM S=4

WN25(a)-100fm7S ScD=1°/pl

WN 500(B)-16 RF3800-12.0FRFF@47RFR 4008@bb)-10@.-n.