每种一贯单位制(例如:厘米克秒制、米千克秒制、码磅秒制、工程制等),都是先确定了基本单位后,再由这些基本单位导出其余的单位(当然,只限于此单位制范围内的其余单位。如,上述的四种单位制都只用于力学领域)。长期以来的概念是:单位制是一组基本单位与它们导出的全部其余单位的总称。换句话说,在任何单位制中,除了基本 Each consistent system of units (for example: centimeters, seconds, yards, pounds, systems, etc.) is determined first by the basic units, and then the remaining units are derived by these basic units (of course, only It is limited to the rest of the units in this unit system. For example, the above-mentioned four unit systems are only used in the field of mechanics. The long-standing concept is that the unit system is the general term for a group of basic units and all of the remaining units they derive. In other words, in any system of units, except basic