BS 1868-1975(R1990) Steel check valves(flanged and butt-welding ends) for the petroleumpetrochemical and allied industries.pdf附件大小：0MB附件格式：1个直链文件，格式为rar 资源简介：BS1868-1975(R1990)Steelcheckvalves(flangedandbutt-weldingends)forthepetro...
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