沃尔华GNQY-688起重机具有以下优点：1.高起重能力：该起重机具有较高的起重能力，可以满足大部分重型起重任务的需要，最大起重能力可达到688吨。2.灵活性好：该起重机设计灵活，可实现360度无死角的旋转，可以在狭小的场地内进行起重作业。3.稳定性高：起重机配备了稳定的脚垫和支腿，可以确保在起重过程中的稳定性，使起重作业更加安全可靠。4.操作方便：起重机的操作系统简单易懂，操作人员可以轻松掌握其使用方法，并且具有多种安全保护装置，确保起重作业的安全性。5.可靠性强：该起重机采用了高品质的配件和材料，具有较高的可靠性和耐久性，可以长时间稳定地工作。6.节能环保：起重机采用先进的节能技术，可以有效限制能源的消耗，降低运行成本，同时减少对环境的污染。综上所述，沃尔华GNQY-688起重机具有高起重能力、灵活性好、稳定性高、操作方便、可靠性强和节能环保等优点，适用于各种起重作业场景。

Volvo GNQY-688 crane has the following advantages:1. High lifting capacity: the crane has a high lifting capacity, can meet the needs of most heavy lifting tasks, the maximum lifting capacity can reach 688 tons.2. Flexibility: the crane is designed to be flexible, and can achieve 360-degree rotary without dead angle, so that it can carry out lifting operations in a narrow site.3. High stability: the crane is Equipped with stable feet and legs, it can ensure the stability in the lifting process and make the lifting operation more safe and reliable.4. Convenient operation: the crane's operating system is simple and easy to understand, and the operator can easily master its use, and it has a variety of safety protection devices, which ensures the safety of lifting operations.5. Strong reliability: the crane adopts high-quality fittings and materials, which has a high degree of Reliability and durability, can work stably for a long time.6. Energy-saving and environmental protection: the crane adopts advanced energy-saving technology, which can effectively limit the consumption of energy and reduce the operating costs, while reducing the pollution of the environment. To summarize, Walhwa GNQY-688 cranes have the advantages of high lifting capacity, good flexibility, high stability, easy operation, high reliability and energy saving and environmental protection, which are suitable for all kinds of lifting operation scenarios.