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.
除了偏置以外，壳体本身的制造技术和镀层也会在弹针的整个使用寿命期限内影响R2。
In addition to bias, the manufacturing technique and plating of the barrel itself influences R2 over the lifetime of the contact.
无法预见无形资产为企业带来经济利益期限的，应当视为使用寿命不确定的无形资产。
If it is unable to forecast the period when the intangible asset can bring economic benefits to the enterprise, it shall be regarded as an intangible asset with uncertain service life.
管道的使用寿命一般在30 ~50年间，但在此期限内往往由于管道老化而发生漏爆事故。
Generally, pipeline lifetime is within the period of 30 to 50 years. Because of ageing of pipeline, the events of leakage and explosion will be taken into place within this period.
管道的使用寿命一般在30 ~50年间，但在此期限内往往由于管道老化而发生漏爆事故。
Generally, pipeline lifetime is within the period of 30 to 50 years. Because of ageing of pipeline, the events of leakage and explosion will be taken into place within this period.
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