$核心能源(EFOI)$ 8-K - Current report Filed: 2019-04-11 AccNo: 0000924168-19-000028 Size: 146 KBItem 4.01: Changes in Registrant's Certifying AccountantItem 5.02: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain OfficersItem 9.01: Financial Statements and Exhibits 网页链接