BiOBr/FeWO 4 with p-n heterostructure were synthesized by a two-step hydrothermal method, and cooperated with K 2 S 2 O 8 to perform ultrasonic degradation of Tetracycline (TC). The experiment was performed for analytical characterization by X-ray photoelectron spectra (XPS), X-ray diffraction...

China’s service sector has experienced a rapid expansion since the late 2000s. Ac-cording to the official statistics, the service GDP share increased from 43% in 2007 to 55% in 2020. In this paper, we first present evidence from additional datasets showing that the recent rise of the service...