当选择一条直线进行编辑时，
2 C* D. r. n. ?/ g& }/ g( X+ X9 h线上的所有对象都会被高亮。: k2 G4 w0 \! n3 `
怎么知道系统是否推断出，打算选择的对象
, \5 T9 x# n# a# t8 d2 `(整条线，线的端点，线的中点)？
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A、从状态行中读取
6 e) `* v6 Q$ N: G& [0 pB、屏幕上将显示一条信息
0 U& C8 \3 h7 [& oC、一个选择对话框将被打开
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( B6 |' J& v* @When selecting a line for editing,
9 k1 s3 {; @9 N+ u% v) Vthe entire line and all three control points will highlight when any part of the line is in the selection ball, D* q* Z9 _' R; L0 w
the Status Line will tell you whether the system has detected a line, line midpoint, or line endpoint.
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答案
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