耳背式助听器使用纽扣式电池，合格的产品使用寿命应在200小时左右，按每日使用12小时计算，有效使用期限约为两周。
BTE button battery life, the qualified products should be in 200 hours or so, is calculated by using 12 hours a day, period of validity for about two weeks.
通过相关案例分析，提出稳态热阻的变化量应作为功率器件寿命试验合格判据之一的建议。
This paper suggests that the change of the steady state thermal resistance should become one of the criterions of the life test.
根据耐久性试验中老化试验的条件，估算了一台合格的高压并联电容器在标准和技术条件规定的条件下运行时，其预期的使用寿命。
According to the conditions of ageing test within endurance test, the expected operation life of a high-voltage shunt capacitor which operates under the standard condition is estimated.
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