题目内容
XLINE command is the construction line command.
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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.
Polylines are much more complex than lines，construction lines and ray lines.
The flexibility of polylines lies in the fact that they are composed of not only lines but also arc segments, and the lines can have width.
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