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The correct answer identifies the purpose of a linked rod as being instrumental in surveying, particularly when it comes to calculating distances. In construction, linked rods are often part of a surveying tool that assists in establishing a clear and accurate line of sight for measurements. They work in conjunction with lasers, allowing for precise distance calculations by reflecting the laser beam.

In surveying, these measurements are critical for ensuring that buildings and structures are aligned correctly and built in accordance with design specifications. This use enhances the overall accuracy and efficiency of the construction process.

The other options do not align with the specific function of a linked rod. Measuring angles on site involves different tools, such as protractors or theodolites, and supporting structural beams typically relies on elements like steel beams or columns, not linked rods. Temporary tent structures are supported through different means, such as stakes and ropes, which also fall outside the typical function of a linked rod. Thus, the clarity and purpose of a linked rod in this context is primarily linked to its role in supporting accurate distance measurements during the surveying process.