数据的导入导出 ..............\exam0401.doc ..............\exam0401.lg4 ..............\exam0402.lg4 ..............\exam0403.lg4 ..............\exam0403.tx ..............\exam0403.txt ..............\exam0403b.lg4 ..............\exam0403b.txt ..............\exam0404.lg4 ..............\exam0405.xls ..............\mydata.xls ..............\myfile.ldt ..............\myfile.txt ..............\result.txt