The application of this method will at least free the estimation from the following two assumptions:1)the life distributions of products at any stress level are of the same or similar type;
应用该方法、至少可以摆脱下述的二个假设：（1）在任一个应力水平上产品的寿命分布都是相同或近似相同类型的；
Ladder type cable tray Model XQJ-T is modified in accordance with the relevant data and our similar products.
t型梯级式电缆桥架是根据国内外有关及我厂同类产品改进而成。
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