三一重工STC250C5-2混动版起重机有以下优点：1. 混动动力系统：该起重机采用混动动力系统，结合了内燃机和电动机的优点，能够在提供强大动力的同时降低燃油消耗和排放。2. 轻量化设计：该起重机采用轻量化设计，选用高强度材料制造，重量相对较轻，能够在同级别起重机中提供更大的起重能力。3. 高效性能：采用升降、回转和变幅多台式液压马达系统，能够快速而平稳地完成各项动作，提高作业效率。4. 精准操纵：配备全方位操纵系统，操作简单，能够实现各个动作的精确控制，提高工作的精度和安全性。5. 安全可靠：采用智能化安全控制系统，具备故障自诊断和应急保护功能，能够及时发现和解决潜在问题，保障工作的安全可靠进行。6. 环保节能：混动动力系统的应用，不仅能够降低燃料消耗和排放，还可以减少环境污染，符合现代对于环保节能的要求。总之，三一重工STC250C5-2混动版起重机具有混动动力系统、轻量化设计、高效性能、精准操纵、安全可靠和环保节能等优点，适用于各种工程作业场合。

Sany STC250C5-2 hybrid crane has the following advantages: 1. hybrid power system: the crane adopts hybrid power system, combining the advantages of internal combustion engines and electric motors, which can provide powerful power while reducing fuel consumption and emissions. 2. lightweight design: the crane adopts lightweight design and is made of high-strength materials, which makes the crane relatively lightweight and provides greater lifting capacity in the same class. 3. efficient performance: it adopts multi-tablet hydraulic motor system for lifting, slewing and luffing, which can complete all movements quickly and smoothly and improve operational efficiency. 4. precise maneuvering: it is equipped with all-round maneuvering system, which can improve operational efficiency. High-efficiency performance: The crane adopts multi-desk hydraulic motor system for lifting, slewing and luffing, which can complete all the movements quickly and smoothly and improve the working efficiency. 4. Precise manipulation: Equipped with omni-directional manipulation system, which is easy to operate, and can realize the precise control of all the movements and improve the precision and safety of the work. 5. Safe and reliable: The crane adopts the intelligent safety control system with self-diagnostic fault and emergency protection function. 6. Intelligent safety control system with self-diagnostic fault and emergency protection function can find and solve potential problems in time to ensure the safety and reliability of the work. 6. Environmental protection and energy saving: the application of hybrid power system not only reduces fuel consumption and emissions, but also reduces environmental pollution, in line with the modern requirements for environmental protection and energy saving. In short, Sany Heavy Industry STC250C5-2 hybrid version of the crane has a hybrid power system, lightweight design, high efficiency performance, precise manipulation, safe and reliable and environmental protection and energy saving advantages, applicable to a variety of engineering operations.