4The Working Group III. Intergovernmental panel on climate change: fifth assessment report[R]. Geneva, Switzerland: The Intergovernmen- tal Panel on Climate Change, 2014.
5Yamamoto O, Takuma T, Hamada S, et al. Applying a gas mix.re containing c-C4Fs as an insulation medium[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2001, 8 (6): 1075-1081.