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中聯重科ZLJ5281JQZ20V起重機的優點有：1. 高起重能力：該起重機具有較高的起重能力，能夠滿足大部分重型起重工作的需求。2. 穩定性好：起重機采用了先進的穩定技術，能夠保證在高空作業時的穩定性，提高工作效率和安全性。3. 操作簡便：起重機配備有可調節的控制系統，操作方便，可靈活調整工作狀態。4. 耐用性強：該起重機采用了高強度鋼材和堅固的結構設計，能夠經受長時間、高負載的工作環境，具有較強的耐用性和壽命。5. 機動性好：起重機具備較好的機動性能，能夠適應復雜的工地環境，保證工作的靈活性和適應性。6. 具備安全保護系統：起重機配備有完善的安全保護系統，包括超載保護、限位保護等功能，保證起重作業的安全性。7. 技術水平高：中聯重科作為國內領先的工程機械制造商，起重機采用了先進的技術和制造工藝，保證產品的品質和性能。8. 維修保養方便：起重機的構造和設計考慮了維修保養的需求，便于對設備進行維修和保養，保證設備的正常運行和使用壽命。

The advantages of Zoomlion ZLJ5281JQZ20V crane include:1. High lifting capacity: the crane has high lifting capacity, which can meet the needs of most heavy lifting work.2. Good stability: the crane adopts advanced stabilization technology, which can ensure stability when working at height, and improve the working efficiency and safety.3. Easy operation: the crane is equipped with an adjustable control system, easy to operate, can flexibly adjust the working condition. 4. strong durability: the crane adopts high-strength steel and sturdy structural design, able to withstand long time, high load working environment, with strong durability and life. 5. good mobility: the crane has good mobility, able to adapt to the complex site environment, to ensure the flexibility and adaptability of the work. 6. equipped with safety protection system: the crane is equipped with a complete safety protection system, including overload protection, limit protection and other functions, to ensure the safety of lifting operations. 7. high level of technology: Zoomlion, as a leading construction machinery manufacturer in China, the crane adopts advanced technology and manufacturing process, to ensure the quality and performance of the product. 8. easy maintenance: the construction and design of the crane take into account the need for repair and maintenance. It is convenient to repair and maintain the equipment to ensure the normal operation and service life of the equipment.