... Structure level and model 结构层次和模型 structure level number 结构层数 grid structure high-level assembly 网架高空悬拼 ...
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... 过程层次数 procedure hierarchy number 结构层次数 structure level number 数据库；数据库 data bank ...
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All things being equal, which they rarely are, the higher the cyclical stress level on an aircraft structure, the fewer the number of reversals it can withstand before breaking.
ECONOMIST: Aircraft fatigue
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