国外标准列表
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[国外标准] BS EN 4531-004-2007 Aerospace series — Connectors, optical, circular, single and multipin, coupled b
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[国外标准] BS EN 448-2009 District heating pipes — Preinsulated bonded pipe systems for directly buried hot wat
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[国外标准] BS EN 442-1-1996 Specification for radiators and convectors. Technical specifications. and requireme
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[国外标准] BS EN 438-2-1991 Decorative high-pressure laminates (HPL) sheets based on thermosetting resins. Dete