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1. The forces keeping the beam straight must , by a fundamental law of static , equal the load tending to fold it up.
2. Soil mechanics and soil stabilization techniques have been used in the construction of footing for buildings.
3. It is these drawbacks which need to be eliminated and which have led to the search for new methods of construction.
谢谢大家啦,有急用啊~~~鞠躬~~