HG/T 20592  法兰 WN 300(B)-40 MM S=10/f1=210

WN 300(B)-40 MM S=10/f1=210

WN500-16fmR

SO 150-150 RF-16FG=6r0h40RF0L283

SO 32(B)-16 RF

2 RF 1300-0.63.5

B WN 800-150 RF Sch40ch104

bl100-16 rf s31603ii 2p2RF/

lwn20-600rfsch80s1015-84-150

wn40B)-600RFB)-16RFH4

PL50-16RFu40mpa0RF S0h40Sh4070SF Rsذ؟