874资源列表
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[国外标准] BS EN 874-1995 Gas welding equipment — Oxygenfuel gas blowpipes (cutting machine type) of cylindrica
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[国外标准] BS 874-3.2-1990 Methods for determining thermal insulating properties. Tests for thermal transmittan
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[国外标准] BS 874-3.1-1987 Methods for determining thermal insulating properties. Tests for thermal transmittan