当文档加载时运行脚本 onload script
所以当页面加载时，由第二个图像标记所引用的图像不可见。
So when the page loads, the images referred to by this second image tag are invisible.
当页面完成加载时，将看到在Symphony Spreadsheet容器的电子表格图表中会显示红色的数据。
When that page finishes loading, you see the data displayed in red in the spreadsheet chart of the Symphony spreadsheet container.
当表单加载时，从ComboBox控件选择一个主数据。
When the form loads, select a master data from the ComboBox control.
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