1. QY20C起重机采用优质材料和先进技术制造，具有良好的品质和可靠性。2. 起重机具有较大的起重能力，最大起重量可达到20吨，能够应对一般工程项目的各种起重需求。3. 采用伸缩式臂架设计，可以根据实际工作需求进行调整，灵活性较高。4. 配备了先进的液压系统，具有稳定的工作性能和操作控制性能。5. 驾驶室设计人性化，操作简单，提高了操作员的工作效率和安全性。6. 可以适应各种复杂的工作环境，如建筑工地、码头、仓库等。7. 起重机具有较高的移动性，可以快速到达工作现场，并能进行360度旋转。8. 采用了各种安全设备，如重载报警器、平衡装置等，有效保证了工作安全。9. 维护保养方便，经济实用，降低了使用成本。总的来说，三一重工QY20C起重机具有良好的质量和可靠性，高起重能力，灵活性强，适应性广，安全性高，操作方便等优点。

1. QY20C crane is made of high quality materials and advanced technology, with good quality and reliability. 2. The crane has large lifting capacity, the maximum lifting capacity can reach 20 tons, which can cope with all kinds of lifting needs in general projects. 3. It adopts telescopic boom design, which can be adjusted according to the actual working needs, with high flexibility. 4. It is equipped with advanced hydraulic system, with stable working performance and operation control performance. 5. The cab design is user-friendly and simple to operate. 6. It can adapt to various complicated working environments, such as construction sites, docks, warehouses, etc. 6. stable working performance and operation control performance.5. The cab design is humanized and simple to operate, which improves the efficiency and safety of the operator.6. It can adapt to various complex working environments, such as construction sites, docks, warehouses, etc.7. The crane has high mobility and can reach the work site quickly and rotate 360 degrees.8. It adopts a variety of safety equipments, such as heavy load alarm, balancing device, etc., which effectively ensure the safety of the crane. and balancing device, etc., which effectively guarantee the work safety. 9. Easy maintenance, economical and practical, which reduces the cost of use. Overall, Sany QY20C crane has the advantages of good quality and reliability, high lifting capacity, flexibility, wide adaptability, high safety and easy operation.