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中聯重科YZK21壓路機的優點包括：1. 功能強大：中聯重科YZK21壓路機具有高效的土壤、礫石、瀝青等壓實能力，能夠滿足不同工程的壓路需求。2. 易于操作：該壓路機采用先進的液壓系統和電子控制技術，操作簡單方便，可根據需要進行多種操作模式的切換。3. 穩定性高：中聯重科YZK21壓路機采用重心低、重量均勻分布的設計，能夠提供穩定的工作狀態，提高施工安全性。4. 燃油經濟性好：該壓路機采用高效節能的發動機和液壓系統，燃油經濟性好，能夠降低施工成本。5. 維護方便：中聯重科YZK21壓路機采用了 modulis-soft 結構化電路設計，易于維護和保養，減少了停工時間，提高了工作效率。總結起來，中聯重科YZK21壓路機具有功能強大、易于操作、穩定性高、燃油經濟性好和維護方便等優點，能夠滿足各種工作環境的壓路需求。

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.