中联重科ZTC120V451起重机的优点有：1. 高效能：ZTC120V451起重机采用了先进的技术和设计，机身结构牢固，能够承载较大的重量。起重机的工作效率高，提升速度快，能够完成大量的工作任务。2. 灵活性强：ZTC120V451起重机可进行360度全方位旋转，起重臂的伸展能够灵活调整，适应不同的工作环境和要求。同时，起重机的操作简便易懂，操作人员能够轻松上手。3. 安全可靠：ZTC120V451起重机配备了各种先进的安全装置，如重载保护、倾斜保护、限位保护等，能够全面检测和保护起重机的运行安全。此外，起重机的结构稳定，可以承受各种复杂工况下的工作要求。4. 节能环保：ZTC120V451起重机采用了先进的动力系统和控制技术，能够减少燃油消耗和排放，并且具备低噪音、低振动的特点。起重机在工作时可以最大限度地减少对环境的影响。5. 维护方便：ZTC120V451起重机在设计时考虑了易维护性，各个关键部件易于检修和更换。此外，中联重科提供完善的售后服务体系，对于起重机的保养和维修提供了可靠的支持。综上所述，中联重科ZTC120V451起重机在高效能、灵活性、安全可靠、节能环保和维护方便等方面具有明显的优点。

The advantages of Zoomlion ZTC120V451 crane are: 1. High efficiency: ZTC120V451 crane adopts advanced technology and design, the structure of the body is solid, and it is able to carry large weight. The crane has high working efficiency, fast lifting speed, and can complete a large number of work tasks.2. Flexible: ZTC120V451 crane can be rotated in a 360-degree full range, and the extension of the lifting arm can be flexibly adjusted to adapt to different working environments and requirements. At the same time, the operation of the crane is simple and easy to understand, and the operator can easily get started.3. Safe and reliable: ZTC120V451 crane is equipped with various advanced safety devices, such as heavy load protection, tilt protection, limit protection, etc., which can comprehensively detect and protect the crane's operation safety. In addition, the structure of the crane is stable and can withstand the working requirements under various complex working conditions.4. Energy saving and environmental protection: ZTC120V451 crane adopts advanced power system and control technology, which can reduce fuel consumption and emissions, and has the characteristics of low noise and low vibration. The crane can minimize the impact on the environment when working.5. Easy maintenance: ZTC120V451 crane is designed with easy maintenance in mind, and each key component is easy to overhaul and replace. In addition, Zoomlion provides a perfect after-sales service system, which provides reliable support for crane maintenance and repair. To summarize, Zoomlion ZTC120V451 crane has obvious advantages in terms of high efficiency, flexibility, safety and reliability, energy saving and environmental protection, and easy maintenance.