GOST 21707-1976 Iron ores agglomerates and pellets Method for determination of gas permeability and layer shrinkage during reduction《铁矿石、烧结矿及碎矿石 还原时矿层收缩及透气性测定方法》.pdf

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GSA W-C-1684-1977 CASSETTES MAGNETIC TAPE AUDIO RECORDING (TWIN-HUB COPLANAR)《音频记录盒式磁带(同面双中枢)》.pdf

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