利勃海尔LTM1040-2.1起重机的优点包括：1. 高度灵活性：该起重机可以进行多种类型的工作，如起重、吊装和装卸等任务，能够适应不同的工作环境和需求。2. 强大的承载能力：LTM1040-2.1起重机具有出色的承载能力，可以安全稳定地提升和携带重型货物。3. 长达40米的伸缩臂：起重机的伸缩臂长度可达40米，能够实现大范围的作业半径，从而提供更大的工作范围和灵活性。4. 高度稳定性：起重机配备了先进的稳定系统，如自动水平校正和防倾倒装置，能够确保在作业时具有良好的稳定性和安全性。5. 操作简便：该起重机采用先进的控制系统，操作简单方便，使操作人员能够轻松地掌握起重机的各项功能。6. 高效率：利勃海尔LTM1040-2.1起重机具有高效率的工作能力，可以快速完成作业任务，提高作业效率。7. 高质量和耐久性：起重机采用优质的材料和先进的制造工艺，具有高度的耐用性和可靠性，能够在恶劣的工作环境下长时间使用。8. 安全性能高：起重机配备了多种安全装置和系统，如过载保护、防溜出和防倾倒装置等，能够确保在作业过程中的安全性。综上所述，利勃海尔LTM1040-2.1起重机具有高度灵活性、强大的承载能力、稳定性高、操作简便、高效率、高质量和耐久性以及高安全性能等优点，适用于各种工程和建筑项目的起重作业。

Advantages of the Liebherr LTM1040-2.1 crane include:1. High flexibility: the crane can perform many types of work, such as lifting, hoisting, loading and unloading tasks, and is able to adapt to different working environments and needs.2. Strong load carrying capacity: the LTM1040-2.1 crane has an excellent load carrying capacity, which allows it to safely and stably lift and carry heavy loads.3. Telescopic boom up to 40 meters: The telescopic boom of the crane can reach up to 40 meters in length, which enables a wide operating radius, thus providing greater working range and flexibility. 4. High stability: The crane is equipped with advanced stabilization systems, such as automatic leveling and anti-tipping devices, which can ensure good stability and safety during operation. 5. Easy operation: The crane adopts advanced control system, which is easy and convenient to operate, enabling the operator to easily master the various functions of the crane.6. High efficiency: Liebherr LTM1040-2.1 crane has a highly efficient working capacity, which can quickly complete the operation tasks and improve the operational efficiency.7. High quality and durability: the crane adopts high-quality materials and advanced manufacturing process, which has a high degree of durability and reliability, and is able to be be used for a long time under the harsh working environment.8. High safety performance: the crane is equipped with various safety devices and systems, such as overload protection, anti-skidding and anti-tipping devices, which can ensure the safety during the operation. To sum up, Liebherr LTM1040-2.1 crane has the advantages of high flexibility, strong load carrying capacity, high stability, easy operation, high efficiency, high quality and durability as well as high safety performance, which is suitable for lifting operations in various engineering and construction projects.