on-the-spot investigation 实地考察

field investigation 现场调查；现场试验

experimental investigation 试验研究

under investigation 在调查研究中

investigation report 调查报告书

sampling investigation 抽样调查

site investigation 现场调查；实地勘测

preliminary investigation 初步调查

general investigation 普查

investigation team 调查组

credit investigation 资信调查，信用调查

federal bureau of investigation n. （美）联邦调查局

epidemiological investigation [医]流行病学调查

investigation depth 探测深度

qualitative investigation 定性分析；质量集中分析

investigation stage 侦查阶段；勘察阶段

soil investigation 土质甸；土壤甸；土壤调查

judicial investigation 司法调查；法院调查

ground investigation 土地勘测

investigation form 调查格式