15 JB/T7949-1999 Weld outer dimensions for steel construction 16 GB50205-2001 Test Standard for Acceptance of Steel Structure 17 GB/T470-1997 Zinc Ingot 18 GB3098.1-2000 Mechanical properties of fasteners-Part 1:Bolts, screws and studs 19 GB3098.2-2000 Mechanical properties ...
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water systems of central air conditioning, improving the stability of equipment operation. Users may weld and conned in parallel the by-pass filters in main return pipes depending on the conditions of circulation system and the pipe diameter should be determined based on the...