题目内容
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.
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In finished drawings you can still see your construction lines.
XLINE command is the construction line command.
To use the command option “horizontal”，enter “HOR” at the command prompt.
A line created by the Ray command extends infinitely in one direction from the first pick point, whose direction determined by the second point.
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