Consider a simple list report that contains only the Product line level from one namespace and the Product type level from another namespace.

看看这样一个简单列表报告：报告只包含来自一个命名空间的Product line级别和来自另一个命名空间的Product type级别。

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The answer is to provide a more useful type of exception that also contains a lower-level exception. Listing 1 shows a simple ApplicationException that does just this

答案是提供一类更有用的异常，它还包含低级异常。

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The pump impeller in welding, simple operation, stable work, welding effect to foreign similar type level.

该机专用于水泵叶轮的焊接，操作简单、工作稳定，焊接效果达到国外同类机型水平。

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