当选择一条直线进行编辑时，* H l% G& W7 I/ [" ^
线上的所有对象都会被高亮。
4 z7 M5 \1 i0 h- b$ y怎么知道系统是否推断出，打算选择的对象
5 q) D- X0 O- y8 |9 ~; B(整条线，线的端点，线的中点)？; \8 k) z& P8 t) Z n; d% h0 b' H b
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A、从状态行中读取
% d% U4 b* I* F( U) }6 t* UB、屏幕上将显示一条信息; j& I1 S9 Y9 b( C. `; l0 g
C、一个选择对话框将被打开
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I6 ], t, S$ S; G$ v7 w! H8 UWhen selecting a line for editing, ' I. t: ^* U1 F9 e3 k
the entire line and all three control points will highlight when any part of the line is in the selection ball, 0 S" q# q1 P5 D4 D
the Status Line will tell you whether the system has detected a line, line midpoint, or line endpoint., A& v7 a7 R, K; J
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答案: B8 s+ G9 ]7 X
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