关系调查 meaning in Chinese

relational surveys

Help - seeking behavior in academic problems of middle school students
文化因素及学业成绩与学业求助的关系调查
First report on the relationship between the occurrence of black spot of pseudo - ginseng and some ecological factors
三七黑斑病发生与生态因子关系调查初报
A research of the relationship between residents ' drinking water status and intestinal infectious diseases in zhuji city
诸暨市居民生活饮用水卫生状况与肠道传染病关系调查