美国国家度量衡大会(NCWM)第84届年会于1999年7月25日至29日在美国北部小镇..
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general conference on weights and meas
... 度量衡,测定,测量 measure 度量衡大会 general conference on weights and measures 度量衡单位 weights and measures ...
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general conference on weights and measures
度量衡大会 general conference on weights and measures 度量衡单位 weights and measures ..
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