The official seal of the liquidation group and the signature of the person in charge of the liquidation group have legal effect and are indispensable. This means that in the liquidation work, in addition to the official seal, the person in charge of the liquidation team needs to personally sign the relevant documents. The seal of the official seal usually represents the will and authorization of the organization or institution and has legal effect. The signature of the team leader represents personal confirmation and commitment, which also has legal effect. The combination of the two can ensure the legality and effectiveness of the document. Legal provisions vary from region to region and specific circumstances. In order to ensure accuracy and compliance, it is recommended to consult a professional lawyer to obtain accurate information and legal advice according to specific circumstances.