A mathematic model is set up by probabilistic method for analyzing concrete crack in early age, which is tested by the observation results of a concrete retaining wall case.

利用概率的方法，建立分析早龄期混凝土开裂的数学模型，并利用一实际的混凝土挡土墙工程观测结果进行验证。

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Through the development practice of ten years and more, it is verified that this set of observation system and method are effective in practice.

经十几年开发实践证明，这套观察系统和方法是行之有效的。

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To ensure the reliability of the precision of photograph control points by continual survey, a method is recommended that increases the appropriate numbers of the observation set and promotes …

为保证连测的像控点精度的可靠性，本文提出了按交会基线长度和交会图形强度，增加适当测回数，提高测角精度的方法。

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