As a special uncertain item, probability events are the important substances of uncertain items in accounting.

或有事项作为特殊的不确定性事项，是不确定性会计的重要内容。

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This dissertation is a part of the important and special project 'long products continuous casting and rolling line '(Item No. : 2001ba306b03) sponsored by Ministry of national science and technique.

本文是国家科技部重大专项课题“长材连铸连轧生产线”(课题号：2001 BA 306b03)的一部分。

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