GOST 23 208-1979 Ensuring of wear resistance of products Wear resistance testing of materials by friction against loosely fixed abrasive particles《制品耐磨性保证 与非刚性固定摩料摩擦时材料耐磨性试验方法》.pdf

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GSFC NASA GPR 8830 1-2008 Facility Operations Managers [Cancelled GSFC NASA GMI 7234 2]《设备操作管理员[GSFC NASA GMI 7234 2作废]》.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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