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The bending stress is zero for the element at b.
在B处的单元体，弯曲应力为零。
youdao
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The margin income and margin cost of technology element are zero;
高科技企业科技要素投入的边际递增性和边际成本趋于零；
youdao
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The margin income and margin cost of technology element are zero;
高科技企业科技要素投入的边际递增性和边际成本趋于零；
youdao