1. Bar charts are represented by a (unit length) (a certain quantity), drawn according to the quantity (straight bars with different lengths), and then arranged in a certain order.

2. The general steps of drawing a bar chart are:

(1) Draw two mutually (perpendicular rays) according to (the size of the graph).

(2) On the (horizontal) ray, reasonably distribute the position of (strips) and determine the (width) and (spacing) of straight bars.

(3) On the ray perpendicular to (horizontal ray), according to the specific situation of (data size), determine how much (unit length) represents.

(4) Draw (straight bars with different lengths) according to (data size) and indicate (quantity).