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４．１词头、数字的一般知识ＳＩ词头用于表示各种不同大小的因数，是ＳＩ单位的倍数单位的一部分。词头不能单独使用，一个ＳＩ词头只有加在一个ＳＩ基本单位（千克除外）或具有专门名称和符号的ＳＩ导出单位前构成相应十进倍数或分数单位才有意义，即词头只有加在单位符...
4.1 General knowledge of prefixes and numbers SI prefixes are used to represent various factors of different sizes and are part of SI unit multiples. The prefix can not be used alone. An SI prefix is only meaningful if it is added to a SI basic unit (except for a kilogram) or a SI derived unit with a specific name and symbol, ie the decimal prefix is only added to the unit symbol. ..