HG/T 20592  法兰 PL 500-25 FF b=10 aa=515δ=41 H=100

pl500-25ff b=10 aa=515δ=41 H=100

LWN40-300 RF B=78 H=229R

pl20-600rf-300ch.50RF0012000 B=49.1B=61.10-4.04b=3092 wn 2

wn200- 150rfff092/h1=12016

WN25(A)-40 RF A=33.4S=

2 FM 450-4.

wn80(B)-150 RF S

so450(B)-10rfe WN700-150 RF1

bl10-25fmM50rf50-30010