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计量单位的国际符号一般用小写字母,如“米”用m、“秒”用~s、“克”用g等,只有以人的姓氏缩写作为计量单位符号时,才用大写,如“安〔培〕”用A、“开〔尔文〕”用K等.根据这一原则,“升”的符号按理应该用小写字母1.我国法定计量单位规定,“升”的符号也可写作L.这是考虑到1单独使用时不大醒目,且容易与阿拉伯数字1混肴.故有,“升”的符号单独使用时,宜写作L;若稿中只用到“毫升”而没有“升”时,则不妨写作ml.
International symbols of units of measure generally use lowercase letters, such as “m” with m, “s” with s, “g” with g, etc., only the surname of the person’s surname as a unit of measure symbols, [Pei] “with A,” open [celtic] “with K. According to this principle,” l “symbol should reasonably use lowercase letters 1. China’s legal units of measurement,” l “symbol can also be written as L This is to take into account that 1 when used alone is not conspicuous and is easily mixed with the Arabic numerals 1. Therefore, the symbol ”l“ should be written as L alone; if only ”ml“ is used instead of ” Liter ", then may wish to write ml.