China Fire Products Network Query System Official Website User Guide China Fire Products Network is a professional fire protection product query platform, providing a wealth of fire protection product information and technical guidance. If you need to inquire about specific fire protection products, learn about the latest regulations and standards, or find a supplier, here are the steps and tips you need to know. Step-by-step instructions 1. Visit the official website First of all, visit the official website of [China Fire Products Network] (www.cfen.net) in your browser, and you will directly enter the homepage of the query system. 2. User Registration and Login The first time you use it, you need to register an account, and the registered user can log in, this step is to ensure the accuracy of the query and protect the security of user data. You can log in with a mobile code or email account. 3. Product information inquiry Enter the product keywords you care about in the search box on the homepage, such as "fire hose" and "fire extinguisher", and quickly narrow down the query. The system supports a variety of search criteria combinations, such as brand, manufacturer, model, etc. 4. Display of query results Click on the search results, and the details of the new product will appear, including the product name, manufacturer, certification status, etc. You can also view the detailed technical description and quality inspection report of the product. Tips and tricks - Multi-keyword combinations: You can get more accurate query results by combining multiple keywords, such as "3C certified fire hose". - Product category browsing: If you don't know the specific keywords, you can browse by product category, and the system provides a detailed product category catalog for your reference. - Latest information attention: In addition to product inquiry, the system homepage also provides the latest fire information and announcements, which can be paid attention to. - Free Register Verification Code: After each successful registration and submission of information, the platform will give a free exclusive verification code as a reward. You can directly click the link when collecting and querying pp123.net 点击复制!
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计算结果:5.7655476996717

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3、四次方根的性质:

(1)、唯一性:对于任何正数 a,它的四次方根是唯一的正数。例如,16的四次方根是2,因为 2⁴=16;

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