HG/T 20592  法兰盖 BL 250(B)-40 RF C=436RFF0-

BL250(B)-40 RF C=436RFF0-

WN 400-150 RF6 S/eqid=80ebfc4e.

bi 350 h=250 b1=140 δ1=8hb=-4

PL25(A)-16 RF D=114 b=3

bl50-900rf d=21616s5b)-0)-16RF

WN 50(B)-63 T S=7am

SO500(B)-16RFfRF s=10 S=2.525)-1

pl125(B)-10M416��ch.3=32

SO250-10RF02c=C=20F R=17