HG/T 20592  法兰盖 BL 50-40 RF300 rf25rf1FⅢ=raa=91B6C=4/

wn40(a)-16RF D=37HGC860Sf�■─Б∙�h00-.5/4

WN100-160 RJ Schh80SF RF S=5 h=287 S=6B)

3 RF 600-1.6 Оҙ=ch45 S=4a4388040S6H/

2 B20SCh80sfInv=122 H= B=F WN80-100 R

BL50-40RF300 rf25rf1FⅢ=raa=91B6C=4/

wn450(b)-10fms=1050RF2S5502B)F

bl450-150 rf