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Warning: fclose() expects parameter 1 to be resource, bool given in /www/wwwroot/www.wendadaohang.com/inc/function.php on line 2475 为什么UG里面工程图里的圆弧用2D Exchange 转换后用CAD打开之后圆弧变成了样条曲线?无法标注?我是6.0 - 99问答网