The relation of stress time to parameter degradation is investigated under the condition of reverse bias of base-emitter junction.
在基极-发射极反向偏置的条件下，研究了应力作用时间与器件参数的退化关系。
By dealing with constraint condition and cell parameter, results of elements' stress and nodal displacement of the keel were obtained under gravity load condition.
对约束条件以及结构单元参数进行了分析，得到了龙骨结构在重力载荷作用下的应力和变形。
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