GB/T 12459  同心异径管 DN 50×40-Sch80SRCpvletM/1/-10F S

DN 50×40-Sch80S RCpvletM/1/-10F S

BL50 -16RFSH85/RF/@so10ch4

PL 15-150 RFB=-1.6i 100-f/@bi 1000

SO40(A)-150 Mfm1200-1.5m450-4.00

bl600b-6ff20.0/105

PL 80B-16 RF16 MT2092-1 r5b

WN 25(B)-16 RF S=3

、pL500-25 RFu0083/u00c6/u0092/u00c3um.htm

c-pl300(b)