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To give you a better idea of what to expect, the book is generally organized into thematic units that build on each other. While the exact number may vary across editions (some have 6 units, others 9), the key topics covered include the foundations of technology, technological systems, materials and energy, communication and design, innovation, and the real-world impacts of technology, as well as the crucial question of accessibility and equity. tecnolog%C3%ADa 9 cristina bonardi pdf gratis gratis gratis