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Drinking medicinal, medicinal-table and natural table mineral water. Methods of determination of nitrate-ions
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Non-ferrous metals and their alloys. General requirements for methods of analysis
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Low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. Electrical safety. Equipment for testing, measuring or monitoring of protective measures. Part 4. Resistance of earth connection and equipotential bonding
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