number of alternation
... 交变磁通（量） alternating flux; 交变次数 number of alternations; 交变电动势 alternating electromotive force; ...
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给出了交变加载（疲劳）断裂韧性指标K_（IF）和断裂的疲劳次数（疲劳寿命）N_f的表达式。
The results are analyzed and on equation between fatigue fracture toughness K_(IF) and fatigue life N_f is formulated in this paper.
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