题目内容
You can erase but not move each line segment already drawn.
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Before you begin to draw a line you have no option but to specify two points from the screen.
The difference between the line and the construction line lies in the fact that the latter is of infinite length and passes through two picked points rather than from one point to another.
In finished drawings you can still see your construction lines.
XLINE command is the construction line command.
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