HG/T 20592  法兰盖 BL 300-100 RF=49.3=-150 rf sc��3@A

BL300-100 RF=49.3=-150 rf sc��3@A

WN20-150RF PL48(B)FRFMF500-0-10m RF60hs

1 FM 700-1.050(B)-1l1 w)-6 RFb==-150 rf sc��3@A

sop FF 5K 600AJ0 RF=20 b

SP-7 40Bwn200-1.6/180-305 R–

WN700(A)-16rf3-6RF50(a)-1021 RF

WN 600-16 RF Sch8026 D=60（ r2