[{"title":"( 6 个子文件 6KB ) 两条直线(四点坐标)计算直线夹角","children":[{"title":"四点计算夹角","children":[{"title":"Module1.bas <span style='color:#111;'> 68B </span>","children":null,"spread":false},{"title":"Form1.frm <span style='color:#111;'> 2.89KB </span>","children":null,"spread":false},{"title":"工程1.vbp <span style='color:#111;'> 624B </span>","children":null,"spread":false},{"title":"MSSCCPRJ.SCC <span style='color:#111;'> 190B </span>","children":null,"spread":false},{"title":"四点计算夹角.exe <span style='color:#111;'> 12.00KB </span>","children":null,"spread":false},{"title":"工程1.vbw <span style='color:#111;'> 50B </span>","children":null,"spread":false}],"spread":true}],"spread":true}]