发表于2025-01-15
Bridges 2025 pdf epub mobi 电子书
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Kids design and build bridges using arches, triangles (trestle), cantilevers, suspension, and counter balances. They make decisions about bridge style, site, cost, safety, and materials -- then test their structures for load and explore the frontier of bridge design and construction.
Bridges 2025 pdf epub mobi 电子书