目前中国供水行业最常用的水量单位是“千立方米”，即1000出现频率很高。使用“千立方米”是妥当的，可是把它的单位符号写成km3就大错特错了。事实上，km3指的是“立方公里”或者“立方千米”，常用于表示海洋容积、地球体积等场合。1km3是1千立方米的100万倍。k是词头（国际 At present, the most commonly used unit of water volume in China’s water supply industry is “1000 cubic meters”, that is, the frequency of occurrence of 1000 is high. It is appropriate to use “thousand cubic meters”, but it is a mistake to write the unit symbol km3. In fact, km3 refers to “cubic kilometers” or “cubic kilometers,” which is often used to indicate the volume of the oceans and the volume of the earth. 1km3 is 1 million times 1 thousand cubic meters. k is the prefix (international