Legal analysis: There are several ways to inquire whether an enterprise exists and identify the authenticity of a business license: 1. It's best to go to the market supervision bureau for business license, so that the information obtained is true and reliable. 2. Telephone enquiry: You can inquire about the local "123 15" consumer complaint hotline. 3. Inquiry of the Industrial and Commercial Bureau: To inquire about detailed enterprise information, you must bring your personal ID card to find it. Or search the local industrial and commercial bureau online. Generally, there are enterprises or individual businesses in official website, and then enter the business license number at a glance. 4. Online inquiry: Click on the links of provinces and cities, and go directly to the websites of local industrial and commercial bureaus-enterprise inquiry-enterprise publicity information inquiry-enter the enterprise name or enterprise registration number for inquiry.

Legal basis: Article 4 of the Announcement of the Ministry of Construction on Relevant Provisions and Contents of Directly Implemented Administrative Licensing Matters (1). The adoption of new technologies, new processes and new materials that do not meet the mandatory standards shall be reported to the construction unit; 2. The construction unit shall hold a special technical demonstration meeting with the consent of the construction administrative department of the province, autonomous region or municipality directly under the Central Government or the standardization management institution of the relevant department of the State Council, and form the minutes of the meeting. The minutes of the demonstration meeting shall be accompanied by a list of experts' signatures. The special technical demonstration meeting shall be attended by experts and technicians from management institutions and relevant units with corresponding standards, and shall not be less than 7 people.