公路改扩建设计首先要对现有路面性能的衰减状况进行调查，以获取路面的基础设计参数。

Highway upgrading design firstly must survey the performance-weakening condition of present pavement to obtain pavement basis designing parameters.

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根据广东省某高速公路路面状况调查结果，研究不同路面病害的形式及分布规律。

According to the investigation results of an expressway condition in Guangdong Province, the patterns and distribution law of various pavement distresses are studied.

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对某单位13台正在高速公路施工中使用的进口“核子仪”放射污染状况进行调查。

The evaluation was based on 13 imported nuclear instruments being used in the construction of expressway.

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