三一重工STC250T5-6混动版起重机主要的优点有：1. 高效节能：混动技术使得起重机在工作时能够自动切换电力和燃油动力，以最佳的方式利用能源，达到节能效果。2. 环保减排：混动技术降低了起重机的排放量，减少了对环境的影响，符合现代社会对环保的要求。3. 灵活多样：起重机具有多种工作模式，可以通过切换模式适应不同的工作场景和需求。4. 操控性能优异：起重机配备先进的操控系统，使得操作更加灵活方便，提高了工作效率。5. 安全可靠：起重机采用了先进的安全控制系统和紧急制动装置，确保了操作人员和周围人员的安全。6. 维护便捷：起重机的维护保养相对简单，降低了维护成本和维修时间。总之，STC250T5-6混动版起重机通过混动技术的应用，在高效节能、环保减排、灵活多样、操控性能优异、安全可靠和维护便捷等方面具有显著优势。

The main advantages of Sany STC250T5-6 hybrid cranes are: 1. energy efficient: hybrid technology allows the crane to automatically switch between electric power and fuel power when working, to optimize the use of energy to achieve energy-saving results. 2. environmental protection and emission reduction: hybrid technology reduces the emissions of the crane, reduces the impact on the environment, in line with the modern society's requirements for environmental protection. 3. flexible and diverse : Cranes have a variety of work modes, you can switch modes to adapt to different work scenarios and needs. 4. excellent manipulation performance: cranes are equipped with advanced control systems, making the operation more flexible and convenient, and improve efficiency. 5. safe and reliable: cranes use advanced safety control systems and emergency braking devices, to ensure the safety of the operator and the surrounding personnel. 6. convenient maintenance: The maintenance of the crane is relatively simple, which reduces the maintenance cost and repair time. In short, STC250T5-6 hybrid version of the crane through the application of hybrid technology, in terms of high energy efficiency, environmental protection and emission reduction, flexible and diverse, excellent maneuverability, safe and reliable and convenient maintenance and other aspects have significant advantages.