鉴于贵我双方于2013年3月11日签订的《氢气、氮气和氩气供应协议》（

In view of the terms stipulated in the "Supply Agreement for Hydrogen, Nitrogen and Argon" (hereinafter referred to as the "Gas Supply Agreement") signed by the two parties on March 11, 2013 and the supplementary agreement signed in December 2018, the annual The annual price adjustment window on November 1st will be changed to a price adjustment on May 1st each year. From the accounting cycle of May 2020 to the end of the accounting cycle of April 2021, both parties will settle the relevant product and service charges at the price confirmed in this letter.

In view of the provisions of the Hydrogen, Nitrogen and ArgonIn Supply Agreement signed by your two parties on March 11, 2013 (hereinafter referred to as the "Gas Supply Agreement") and the Supplementary Agreement signed in December 2018, the price adjustment will be made on 1 November each year as the annual price adjustment window. From the bookkeeping cycle in May 2020 to the end of the bookkeeping cycle in April 2021, both Parties will settle the relevant products and services charges at the prices recognized in this letter.

In view of the terms of the hydrogen, nitrogen and argon supply agreement signed by both parties on March 11, 2013 (hereinafter referred to as the "gas supply agreement") and the supplementary agreement signed in December 2018, the annual price adjustment window will be changed from November 1 of each year to May 1 of each year. From May 2020 to April 2021, Party A and Party B will settle the charges for relevant products and services according to the price confirmed in this letter.