It should be on the signature page of the plan, signed by the base director and department director of each center, and stamped with the big red seal of the base, including those from the statistical unit, and not less from the sponsor. When signing and sealing It’s best to prepare a few more copies. I originally made a dozen copies of the signature page of a phase 2 project (5 hospitals). Each provincial bureau gave me a red stamp, but the seam seal was not stamped. I mailed it to the national bureau. I received the acknowledgment 3-4 weeks after filing~PS: Not all provincial bureaus do not have acknowledgment. The provincial bureaus in Liaoning have acknowledgments, and the provincial bureaus in Xinjiang and Tianjin are also relatively standardized