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“t/a”“m3”“kg”分别是计量单位“吨每年”“立方米”“千克”的国际符号,在GB 3100~3102-1993《量和单位》中称其单位符号。关于单位符号的使用,由国家技术监督局计量司和标准化司组织编写、中国标准出版社1996年出版的《国家标准统一宣贯教材量和单位国家标准实施指南》一书指出:“单位符号可以在一切需要简单明了表示的地方使用,也可以用于叙述性文字中。并不局
”t a “ ”m3 “ ”kg “ are the international symbols of the unit of measure ”Tons per year “ ”Cubic meters “ ”kg Quantity and unit “in the unit symbol. The use of unit symbols by the Bureau of Metrology and Standardization Division of the State Bureau of Technical Supervision prepared by the China Standard Press, published in 1996, ”the national standard of uniform standards and implementation of national standards for teaching materials volume implementation guidelines,“ a book: ”unit symbol It can be used wherever it needs to be plain and concise, or it can be used in narrative text.