三一重工SY135C（国四）挖掘机具有以下优点：1. 动力(lì)强劲：搭载了(liǎo)高效的动力(lì)系统，具备出色的动力(lì)输出能力(lì)，能够应对各种工作场(cháng)景和(hé)复杂土地情况。2. 燃油经济性好：采用了(liǎo)先进的燃油系统和(hé)节能技术，能够有效降低燃油消耗量，提高工作效率。3. 操控方(fāng)便：配备了(liǎo)人性化的操控系统，操作简单方(fāng)便，能够准确、灵活地完成各种工作要求。4. 稳(wěn)定性高：具备优良的抗颠翻性能，稳(wěn)定的工作平台能够保证挖掘机在工作过程中的安全性和(hé)稳(wěn)定性。5. 维护方(fāng)便：结构合理，维修点布局合理，方(fāng)便进行日常维护和(hé)保养，能够有效延长挖掘机的使用寿命。6. 外观精美：外观设计时尚美观，符合人体工学原理，提高了(liǎo)操作员的工作舒适度(dù)。7. 安全性高：采用了(liǎo)先进的安全技术和(hé)设备，加强了(liǎo)挖掘机在工作过程中的安全保护措施。8. 多功能性强：可以搭载多种附件和(hé)工具，实现多种工作功能，提高工作的灵活性和(hé)效率。总的来说，三一重工SY135C（国四）挖掘机具有动力(lì)强劲、燃油经济、操控方(fāng)便、稳(wěn)定性高、维护方(fāng)便、外观精美、安全性高和(hé)多功能性强等优点。它是一台高性能的挖掘机，适用于各种工程施工和(hé)土地开垦等作业场(cháng)景。

Sany SY135C (National IV) excavator has the following advantages: 1. Strong power: equipped with a highly efficient power system, with excellent power output, able to cope with a variety of work scenarios and complex land conditions. 2. Good fuel economy: the use of advanced fuel system and energy-saving technology, can effectively reduce fuel consumption and improve work efficiency. 3. Convenient manipulation: equipped with a humanized Control system, simple and convenient operation, can accurately and flexibly complete a variety of work requirements. 4. high stability: with excellent anti-subversion performance, stable working platform can ensure the safety and stability of the excavator in the work process. 5. convenient maintenance: reasonable structure, reasonable layout of the repair point, easy to carry out routine maintenance and repair, can effectively extend the service life of the excavator. 6. exquisite appearance: The appearance design is fashionable and beautiful, in line with the principle of ergonomics, which improves the operator's working comfort.7. High safety: advanced safety technology and equipment are adopted to strengthen the safety protection measures of the excavator in the working process.8. Strong multifunctionality: it can carry a variety of attachments and tools to realize a variety of working functions, which improves the flexibility and efficiency of the work. Overall, Sany SY135C (National 4) excavator has the advantages of strong power, fuel economy, easy to maneuver, high stability, easy maintenance, beautiful appearance, high safety and high versatility. It is a high-performance excavator suitable for a variety of engineering construction and land reclamation and other operating scenarios.