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Han strategic fortification
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Han strategic fortification
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工学
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Han strategic fortification
汉代关塞建筑
汉代为军事防御和开发边疆,沿长城一线营造了大量关塞建筑,如烽、燧、关、侯城和屯戍城,作为报警和驻军之用,形成坚固的工程防御体系。通过考古勘察,并同出土的简牍记载对照,得知汉代关塞建筑的形制。
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spherical spiral
spherical spreading loss
spherical strain tensor
spherical stress tensor
spherical subgroup
spherical subsystem
spherical sum
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spherical surgery
spherical symmetrization
spherical symmetry
spherical tangent image
spherical tank
spherical tensor
spherical tessellation
spherical torus
spherical transformation
spherical triangle
spherical triangular coordinate
spherical trigonometry
spherical type
spherical vector field
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spherical wave equation
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