When drawing a straight line, both endpoints should be prominent, neither endpoint of the line segment should be prominent, and the ray has an endpoint (the point of the second letter).
When making point E, you can use compasses to make an arc with point O as the center and point BO as the radius (as shown in the figure).
If there is no special requirement, it can also be measured with a scale.
If it is the answer, you must draw a conclusion! ! !