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直筋下料长度=构件长度-保护层厚度+弯钩增加长度（）

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绘制根轨迹的充分必要条件为。

Anne usually was only willing to help those who suffered from the same disease as she did.

By means of __________ （being young and being old) the author reveals the advantages of being old.

正偏PN结中，耗尽区边界的少子小于平衡态少子。