未确知有理数期望
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The rational expectation is not known
以上为机器翻译结果，长、整句建议使用 人工翻译 。
提出未确知有理数用于施工网络计划，介绍未确知有理数概念、运算、未确知期望。
Putting forward using unascertained rational number to construction network, this paper also introduced the conception and operation of unascertained rational number and unascertained expectation.
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