当棱柱形梁受纯弯曲时，这些公式给出了它的主力和主变。
These formulae give us the stress and strain in a prismatic beam when it is subjected to pure bending .
介绍了以四角棱柱体土方公式为计算模型的试算法确定大型场地平整最优设计标高近似解的方法。
Some influential factors on the design elevation for leveling a site and its revising steps to calculate the earthwork have been introduced.
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