HG/T 20592  法兰盖 BL 10-40 RFFM s b=40025 rf303

bl10-40rfFM s b=40025 rf303

LWN 20-900 RJ9

LWN50(B)-300RF1FrfaF1�2RF B=fF I

pl150-6t-F5-10R h0592

WN32(B)-25RFHG/ RFR=ذ؟â•‌)=

WN250-150 RF sch4

SO 80(A)-16 RF b=4

so80a-40rf)f0==20615��h440 hg/m.hF Sc

LWN50-150 T

LWN 400-300 M Sch80Samp;