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张华同志:你来信谈到阅读《消防》杂志和其他科普文章时遇到了一些困难,不知道怎样识别和换算计量单位,也不知道国际单位和我国目前使用的公制工程制有何区别和联系,现简复如下:目前世界上使用的度量衡制度,分公制和英制两大类。在公制和英制中,又各包含绝对制和工程制两种。绝对制和工程制的区别在于它们选用的基本度量单位不同。在绝对制中以长度、质量、时间为基本单位;在工程制中以长度、重量、时间为基本单位。公制绝对制中又分为厘米·克·
Comrade Zhang Hua: You have encountered some difficulties in reading the “Fire Protection” magazine and other popular science articles. You do not know how to identify and convert units of measurement. You also do not know the differences and links between the International Units and the metric systems currently used in our country , Are summarized as follows: The world’s current system of weights and measures, divided into two major categories and the British system. In both metric and imperial systems, it contains both absolute and engineering. The difference between absolute and engineering is that they use different basic units of measurement. In absolute system in terms of length, quality, time as the basic unit; in the engineering system to length, weight, time as the basic unit. Metric absolute system is divided into centimeters grams