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一九九九年七月二十日③序号国家标准编号国象标准名称代替标准号批准日期实施日期29**/T二0*22一1989炭黑比表面积的测定氮吸附方法C毗onblack－Detemlnatlonofspecificsu而ce——a—NltYOgenadso…ionme仙d*B/T10*22二9891999—0629200005—of30口*/TI二618一1999铜管接头Cnn
July 20, 1999 ③ No. National Standard No. National Standard Name instead of standard No. Date of Approval 29 ** / T two 0 * 22 a 1989 Determination of specific surface area of carbon black Nitrogen adsorption method C onpalack- Detemlnatlonofspecificsu ce - a-NltYOgenadso ... ionme ce d * B / T10 * 22 two 9891999-0629200005-of30 mouth * / TI two 618 one 1999 brass fittings Cnn