一、发展历史我们在建造房屋、筑路、架桥,甚至开展复杂的科学研究之前,都要制订工作计划。其内容包括做什么,怎么做,谁去做,什么时候做,什么时候结束等。计划通常用图表方式来表示,最常用的是水平线条图表,通常叫作条形图或横道图。横道图具有直观、易懂、便于检查和计算 I. History of Development We must work out plans before we build houses, build roads, bridge, and even conduct complicated scientific research. Its contents include what to do, how to do it, who will do it, when it will be done, when it will end, etc. Plans are usually represented graphically. The most commonly used is a horizontal line chart, often called a bar chart or a bar chart. Bar chart is intuitive, easy to understand, easy to check and calculate