Construction of Theoretical Capital Progress Curve Model of Power Grid Infrastructure Project Based on Contract Payment TermsJunyi Yang, Fuchang Yue, Qian Gao, Shijie Xu, Yu Hong, Lixin Wang and Jie TangE3S Web Conf., 235 (2021) 01076DOI: https://doi.org/10.1051/e3sconf/202123501076