$诺贝尔能源(NBL)$ 8-K - Current report Filed: 2017-05-23 AccNo: 0000072207-17-000045 Size: 599 KBItem 1.01: Entry into a Material Definitive AgreementItem 7.01: Regulation FD DisclosureItem 9.01: Financial Statements and Exhibits 网页链接