field investigation and sampling

Field investigation includes traffic volume, axle loads, types, amount, and severity of pavement distress, measurement of deflection of pavement highway structure, and pavement sampling.

路面调查工作包括交通量调查，轴载调查，路面损坏的类型、数量与严重程度的记录，路面结构的弯沉以及路面取样。

A field investigation of corrosion status of buried pipeline and measurement of the soil parameters were conducted, accompanied with corrosion test piece laying and field sampling.

进行了现场腐蚀状况调研，对现场埋地管道的土壤腐蚀情况就地测量了相关参数，并进行了腐蚀试片埋设和现场取样工作。

Methods Systematic sampling method was used in field Oncomelania investigation, and laboratory and field simulating drowning methods were also performed to observe survival of Oncomelania.

方法应用系统抽样法进行现场查螺，现场和实验室模拟水淹实验观察钉螺存活情况。