Legal analysis: The following three industries should choose their own industries when invoicing. : 1. The development, production and sales of computer hardware-level peripherals are classified as "computer, communication and other electronic equipment manufacturing". 2. Technical services, system integration, network integrated wiring, three-dimensional design and computer graphic design are classified as "software and information technology services". 3. Sales: office supplies, and the industry classification is "retail".

Legal basis: Measures for the Administration of Invoices in People's Republic of China (PRC).

Twenty-first invoices that do not meet the requirements shall not be used as financial reimbursement vouchers, and any unit or individual has the right to refuse to use them.

Twenty-second invoices shall be issued in accordance with the prescribed time limit, sequence and columns, all of which shall be issued at one time and stamped with special invoices. If an individual's VAT invoice is not written in the header, it is an unqualified invoice with incomplete information and cannot be used as a financial reimbursement voucher.

Twenty-third units and individuals that install tax control devices shall use tax control devices to issue invoices in accordance with regulations, and submit invoice data to the competent tax authorities on schedule. When using non-tax-controlled electronic equipment to issue invoices, the software program description data of non-tax-controlled electronic equipment shall be reported to the competent tax authorities for the record, and the invoice data shall be saved and submitted in accordance with the provisions. The state promotes the use of online invoice management system to issue invoices, and the specific management measures shall be formulated by the competent tax authorities of the State Council.