当选择一条直线进行编辑时，
, ^% t8 C. i, @; F3 T @$ s线上的所有对象都会被高亮。
& ?* Y0 u. i3 j! J* P+ G. `怎么知道系统是否推断出，打算选择的对象
. _7 x/ N% k6 w' b8 p% S( o(整条线，线的端点，线的中点)？6 O! k3 x P( ^! c3 k/ H) C' ~% z
+ J+ @+ ]. [6 N( p* [# q- L. nA、从状态行中读取# x" s5 f$ d! g( S% z8 `
B、屏幕上将显示一条信息% V4 ]# [3 m" N- U7 ?" V
C、一个选择对话框将被打开
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& a: n) h2 L. v+ V4 [; iWhen selecting a line for editing,
" x7 D0 ]* n& \the entire line and all three control points will highlight when any part of the line is in the selection ball,
' |; i8 r2 ?$ B1 P2 T8 b" Wthe Status Line will tell you whether the system has detected a line, line midpoint, or line endpoint.( R. P9 _3 c" } D2 v
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答案/ e' F: b* B6 e6 x, F! V
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