Qiaoyuan Co., Ltd.: internal control assurance report

Qiaoyuan Co., Ltd.: internal control assurance report all shareholders of Sichuan Qiaoyuan Gas Co., Ltd. have been entrusted to verify the confirmation of the effectiveness of internal control related to the financial statements on December 31, 2021 involved in the attached internal control evaluation report prepared by the management of Sichuan Qiaoyuan Gas Co., Ltd. (hereinafter referred to as Qiaoyuan gas). The responsibility of the management of Qiaoyuan gas is to establish and improve the internal control and maintain its effectiveness in accordance with the basic norms of enterprise internal control and relevant regulations, and ensure that the internal control evaluation report truly and completely reflects the internal control related to the financial statements of Qiaoyuan gas as of December 31, 2021