The earth pressure is calculated by using Rankin theory or Column theory.
通常采用朗金理论或库仑理论计算作用在挡土墙上的土压力。
Use the theory to the practice and this is the right flight skill, not just control the column.
真正的飞行技术不是单纯的控制操纵杆，而是把理论和实践有机的结合在一起。
Use the theory to the practice and this is the right flight skill, not just control the column.
真正的飞行技术不是单纯的控制操纵杆，而是把理论和实践有机的结合在一起。
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