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Engineers who design structures must completely understand the problem to be solved, which includes the complexities of the site and the customer needs. To design for safety and longevity, engineers consider the different types of loads, how they are applied and where. Engineers often aim for a design that is strongest and lightest possible—one with the highest strength-to-weight ratio. test https://drive.google.com/file/d/0BzO37YlyxqYWUmdvaVRiUk1NMlE4YkFIWHZmWUtNUVNNMlFV/view https://drive.google.com/file/d/1sI8Bl_tj8y2fH8MO1r6pUlVuMZRSvrDF/view?usp=sharing