三一重工STC250C4起重机的优点有：1. 具有较大的起重能力：STC250C4起重机的最大起重能力为25吨，可以满足大部分起重作业的需求。2. 高效的起重速度：STC250C4起重机配备了高性能的液压系统和独特的传动系统，能够实现快速、稳定的起重操作，提高工作效率。3. 灵活的操作性能：STC250C4起重机采用先进的电控系统，操作简便、灵活，能够满足不同工况下的起重需求。4. 安全可靠：STC250C4起重机具备完善的安全保护装置，采用了先进的液压制动系统和液压伸缩支腿系统，确保起重过程的安全可靠。5. 节能环保：STC250C4起重机采用了先进的液压系统，能够实现节能运行，并且减少噪音和尾气的排放，符合环保要求。总体来说，STC250C4起重机具有起重能力强、操作灵活、安全可靠、节能环保等优点，适用于各种起重工作。

The advantages of Sany STC250C4 crane are: 1. large lifting capacity: STC250C4 crane has a maximum lifting capacity of 25 tons, which can meet the needs of most lifting operations. 2. efficient lifting speed: STC250C4 crane is equipped with a high-performance hydraulic system and a unique transmission system, which can achieve fast and stable lifting operations, improve the Flexible operation performance: STC250C4 crane adopts advanced electronic control system, easy to operate, flexible, can meet the lifting needs of different working conditions. 4. safe and reliable: STC250C4 crane has a perfect safety protection device, adopts advanced hydraulic braking system and hydraulic telescopic outrigger system, to ensure the safety and reliability of the lifting process. 5. energy-saving and environmental protection: STC250C4 crane adopts advanced hydraulic system, can realize energy-saving operation, and reduce noise and exhaust emissions, in line with environmental requirements. Overall, STC250C4 crane has the advantages of strong lifting capacity, flexible operation, safety and reliability, energy saving and environmental protection, and is suitable for a variety of lifting work.