A. The fastest delivery time is 7 days (commonly used products).

B: Pre-sales service: product technical survey in the industry, thorough understanding of customers' product needs, sample trial production and delivery, technical information communication, product quality confirmation and improvement.

C: In-sale service: patiently and carefully introduce and display products for customers, explain the technology and use of products, answer any questions raised by customers, so that customers trust us.

D: After-sales service: 24-hour on-site service speed, quickly solve and handle customer complaints, track product quality information, quickly meet customer needs, so that customers are satisfied.