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标准库
(4)
NB/T 47027-2012
Hexagon nut for pressure vessel flange
NB/T 47027-2012
Flange rod for pressure vessel -type C
NB/T 47027-2012
Equal-length twin stud for pressure vessel flange -type B
NB/T 47027-2012
Equal-length twin stud for pressure vessel flange -type A
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