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徐工QY70KD起重機有以下優點：1. 高承載能力：徐工QY70KD起重機具有70噸的最大起重能力，可以滿足大部分起重作業的需求。2. 靈活性強：該起重機的轉臺和支腿具有360度旋轉能力，可以實現全方位的起重作業，適應各種工況和使用環境。3. 操作簡便：徐工QY70KD起重機采用新一代液壓變量技術，操作更加簡單、靈活，能夠精確控制起重機的動作。4. 安全可靠：該起重機配備了多種安全裝置，包括過載保護、防傾翻裝置等，確保起重作業的安全。5. 能效高：徐工QY70KD起重機采用先進的液壓系統和電子控制系統，能有效提高能效，減少能源消耗。6. 維護便捷：該起重機的零部件采用模塊化設計，易于維修和更換，降低了維護成本。總的來說，徐工QY70KD起重機具有承載能力強、靈活性高、操作簡便、安全可靠、能效高以及維護便捷的優點，適用于各種起重作業需求。

XCMG QY70KD crane has the following advantages: 1. high load capacity: XCMG QY70KD crane has a maximum lifting capacity of 70 tons, which can meet most of the lifting operations. 2. flexible: the crane's turntable and outriggers have a 360-degree rotating capacity, which can realize all-around lifting operations and adapt to a variety of working conditions and use of the environment. 3. easy to operate: XCMG QY70KD crane adopts a new generation of hydraulic variable technology, the operation is more simple, flexible, and can accurately control the movement of the crane. 4. safe and reliable: the crane is equipped with a variety of safety devices, including overload protection, anti-tipping device, etc., to ensure the safety of lifting operations. 5. high energy-efficiency: XCMG QY70KD crane adopts an advanced hydraulic system and electronic control system, which effectively improves the energy efficiency and reduces energy consumption. 6. and reduce energy consumption.6. Convenient maintenance: the crane's parts adopt modular design, which is easy to repair and replace and reduces the maintenance cost. Overall, XCMG QY70KD crane has the advantages of strong carrying capacity, high flexibility, easy operation, safety and reliability, high energy efficiency and convenient maintenance, which is suitable for all kinds of lifting operations.