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GB/T 12990-1991 Water quality-Microbial community biomonitoring-PFU method via email in 1-3 business day VALID please email coc@codeofchina.com for quotation
GB/T 22727.1-2008 Limits and methods of measurement of certain hazardous substances in telecommunication product Part 1: Telecommunication terminal 540 (USD) via email in 1-5 business day VALID
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