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The main beam of a structure, such as a bridge or building, is typically shaped like a rectangular, I-beam, or T-beam, depending on the design requirements and load distribution. The I-beam, for instance, has a cross-section resembling the letter "I," which provides high strength-to-weight ratio and stability while minimizing material use. This shape allows for efficient support of loads while also enabling the structure to resist bending and shear forces. Overall, the specific shape chosen is crucial for ensuring the structural integrity and performance of the beam.

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