GB/T 12459  弯头 DN 50-990EL0b0S=5 A=4/40-9R4-1F Sch40FFb fmF题mp0-1

DN 50-9 90EL0b0S=5 A=4/40-9R4-1F Sch40FFb fmF题mp0-1

WN150(B)-40 RF01620s=45975090J s=34

WN300-150RFsc

bi2000sFA250025 n40RF S=6FF

1 M 500-1.6rfb=b1

wn50(B)-100RF Srf1

wn100-300 rf1005/=5/ S=6rf50(/700-4.8010 S S=6=4-1.04F

2 RF 2800-0.620δ1=18F0