Research on Pump Inspection Cycle Early Warning Method Based on Big DataDu Lihong, Liu Yufang, Cao Fei, Li Fang, Min Guizhi, Liu Zhongbo, Xia Zhixue and Zhang ZhanminE3S Web Conf., 245 (2021) 02026DOI: https://doi.org/10.1051/e3sconf/202124502026