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1、 https:crsreports.congress.gov June 16, 2020CO2 Underground Injection Regulations: Selected Differences for Enhanced Oil。

2、 https:crsreports.congress.gov June 16, 2020Fossil Energy Petroleum Accounts: FY2021 AppropriationsIntroduction In Febru。

3、 Environmental Effects of Battery Electric and Internal Combustion Engine Vehicles June 16, 2020 Congressional Research 。

4、 https:crsreports.congress.gov June 16, 2020Congresss Power Over Appropriations: A PrimerA number of constitutional and 。