中联重科YZK21压路机的优点包括：1. 功能(néng)强大：中联重科YZK21压路机具有高效的土(tǔ)壤、砾石、沥青等压实能(néng)力，能(néng)够满足不同工程的压路需求。2. 易于操作：该压路机采用先进的液压系统和电子控制技术，操作简单方便，可根据需要进行多种操作模式的切换。3. 稳定性(xìng)高：中联重科YZK21压路机采用重心低、重量均匀分布的设计，能(néng)够提供(gōng)稳定的工作状态，提高施工安全性(xìng)。4. 燃油经济性(xìng)好：该压路机采用高效节能(néng)的发动机和液压系统，燃油经济性(xìng)好，能(néng)够降低施工成本。5. 维护(hù)方便：中联重科YZK21压路机采用了(liǎo) modulis-soft 结构化电路设计，易于维护(hù)和保养，减少了(liǎo)停(tíng)工时间，提高了(liǎo)工作效率。总结起来，中联重科YZK21压路机具有功能(néng)强大、易于操作、稳定性(xìng)高、燃油经济性(xìng)好和维护(hù)方便等优点，能(néng)够满足各种工作环境(jìng)的压路需求。

The advantages of Zoomlion YZK21 roller include:1. Powerful function: the Zoomlion YZK21 roller has efficient soil, gravel, asphalt and other compaction capacity, which can meet the compaction needs of different projects.2. Easy to operate: this roller adopts advanced hydraulic system and electronic control technology, which makes it easy and convenient to operate, and can be switched to multiple operation modes as needed.3. High stability: Zoomlion YZK21 roller adopts the design of low center of gravity and even weight distribution, which can provide stable working condition and improve the construction safety. 4. Good fuel economy: This roller adopts energy efficient engine and hydraulic system, which has good fuel economy and can reduce the construction cost. 5. Easy maintenance: Zoomlion YZK21 roller adopts modulis-soft structured circuit design, which is easy to maintain and service, reduces downtime and improves work efficiency. To summarize, Zoomlion YZK21 roller has the advantages of powerful function, easy operation, high stability, good fuel economy and convenient maintenance, which can meet the road roller needs in various working environments.