当选择一条直线进行编辑时， z# S9 X/ C- R( O6 ^( i
线上的所有对象都会被高亮。# X* j/ }$ X+ N& N4 h" ~: E
怎么知道系统是否推断出，打算选择的对象4 d# j* }. P4 p' l7 r) D
(整条线，线的端点，线的中点)？ 9 Q6 o& L1 q2 }: \8 O3 f; M4 M: Q$ T/ Q6 R6 Q- Q' f3 U! e
A、从状态行中读取 8 n* s5 X) P5 |: ?B、屏幕上将显示一条信息 7 V3 j/ s; E- r: g/ S! v A6 g1 YC、一个选择对话框将被打开: _/ O& F' K6 a$ k
( k! m" T- L* ~9 p0 j# G* G7 U! Y" X- k$ c2 e( w% l# d
When selecting a line for editing, ; ?( v3 p; h }: r
the entire line and all three control points will highlight when any part of the line is in the selection ball, 5 @ B3 Y3 d9 Q9 {) b) f. @
the Status Line will tell you whether the system has detected a line, line midpoint, or line endpoint.: w- p' e" e& H5 o& v
; ]& c6 ^5 p& X1 y# y' @& F( p1 `) y
5 \- K# a/ S1 ^- G% m6 r+ W8 K# N8 o! w. `5 [# E% h 答案1 _1 ^; m$ ~8 H& n8 y1 y
