当选择一条直线进行编辑时，
+ |/ ^3 @+ q+ }8 j6 H* i线上的所有对象都会被高亮。/ e; m: Z- T0 O" w+ H- d
怎么知道系统是否推断出，打算选择的对象; W0 i7 _. Z# K
(整条线，线的端点，线的中点)？+ g0 y" L& @) ?1 N3 T
! {+ w) Y( B, wA、从状态行中读取
- w4 `% F. d5 h" V& y0 l7 \2 O: ^B、屏幕上将显示一条信息- [! O! m9 S3 f' b# O& L1 c
C、一个选择对话框将被打开
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( q/ a M1 [! fWhen selecting a line for editing, . ?5 D. ~" [8 i% }2 j4 L) y- a
the entire line and all three control points will highlight when any part of the line is in the selection ball, 5 i8 X9 r/ Y3 D! `. G3 J
the Status Line will tell you whether the system has detected a line, line midpoint, or line endpoint." U* o$ K0 X& A* I
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* g6 \1 K- v* {8 u3 w0 e$ s答案
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