GB/T 31253-2014 Standard PDF file download ; GB/T 31253-2014 Standard english preview version download

GB Standard Code	GB/T 31253-2014
Standard Category	China National Standards
GB Standard English Title	Natural gas―Validation for gaseous reference materials―Direct measurement of calorific value and density
GB Standard Chinese Title	天然气气体标准物质的验证发热量和密度直接测量法
Chinese Version Price	$15 USD per 50 pages
English Translation Price	About $15 per 1 page; Inquire us for detail price

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