For files opened in Excel format, all sheets that do not contain a defined print range are printed. The same behaviour occurs when you export the Excel formatted spreadsheet to a PDF file.
对于以 Excel 格式打开的文件，将打印所有不包含定义的打印范围的工作表。将 Excel 格式的电子表格导出为 PDF 文件时，将会发生同样的情况。