Harbin Welding Huatong: China Securities Co.Ltd(601066) letter of commitment on initial public offering and listing on gem of Harbin Welding Institute Huatong (Changzhou) welding industry Co., Ltd. China Securities Co.Ltd(601066) (hereinafter referred to as “the company”) serves as the sponsor of initial public offering and listing on gem of Harbin Welding Institute Huatong (Changzhou) welding industry Co., Ltd. (hereinafter referred to as “the issuer”), It is hereby committed that the documents prepared and issued by the company for the issuer’s initial public offering and listing on the gem are free from false records, misleading statements or major omissions, and bear corresponding legal liabilities. If the company fails to exercise due diligence and the issuer’s prospectus and other information disclosure materials have false records, misleading statements or major omissions, resulting in losses to investors in securities issuance and trading, the company will compensate investors for losses according to law. If the company fails to be diligent and responsible, and there are false records, misleading statements or major omissions in the documents prepared and issued for the issuer’s initial public offering and listing on the gem, resulting in losses to investors, the company will compensate investors for the losses according to law. Hereby promise.