当选择一条直线进行编辑时，. E5 O! ~) s3 E( x! K3 B
线上的所有对象都会被高亮。
3 n2 z* R+ I" f5 H6 n怎么知道系统是否推断出，打算选择的对象% Z( G1 L0 m( ~9 J) [( l
(整条线，线的端点，线的中点)？
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A、从状态行中读取
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C、一个选择对话框将被打开
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When selecting a line for editing,
4 L# W: `; t$ {% Y& H0 e4 Y' Ythe entire line and all three control points will highlight when any part of the line is in the selection ball, 4 S6 M* C7 B7 U- @
the Status Line will tell you whether the system has detected a line, line midpoint, or line endpoint.
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