当选择一条直线进行编辑时，* N6 i& ^9 j( i9 V- `
线上的所有对象都会被高亮。& l% o3 e2 b% l/ W% }
怎么知道系统是否推断出，打算选择的对象; S5 a( w: u0 @& F5 ?9 ^
(整条线，线的端点，线的中点)？. s/ A" f; j( @3 h9 z s2 s
* u7 p9 @. N, f0 ?
A、从状态行中读取8 K% H) Z* f2 G8 t, U+ ]) g4 H
B、屏幕上将显示一条信息1 x5 P: D( ~0 t: k/ R9 ]
C、一个选择对话框将被打开
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3 D: a! @4 K w* x4 qWhen selecting a line for editing, `& K( S2 ^, L
the entire line and all three control points will highlight when any part of the line is in the selection ball, 0 {6 ^1 r5 P- `
the Status Line will tell you whether the system has detected a line, line midpoint, or line endpoint.- k7 H3 U, ]( ?- D4 V6 k) R g
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答案9 t' J0 u; ~+ A" M- P6 D
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