[单选题]单选19、RL串联电路的的时间常数τ为( )。

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• ●    CASE OF DEATH OR SERIOUS INJURY TO A PERSON IN AN ACCIDENT OR SHIPPING DISASTER i（）.
• ●    Mainly eat 3 or 4 partly cloudy to overcat occaional rain（）lowly outh moderate or good.
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• ●    （）mean any peron by whom or in whoe name or on whoe behalf a contract of carriage of good by ea ha been concluded with a carrier，or any peron by whom or in whoe name or on whoe behalf the good are actually delivered to the carrier in relation to the contract of carriage of good by ea.
• ●    If he i a common carrier，he i abolutely reponible to the owner of the good carried （）any lo or damage to them unle caued by an Act of God or the Queen’ enemie，or the inherent vice in the good themelve，or the negligence of the owner of the good，or a general average acrifice.
• ●    系统中雷达状态包括Unknown、Operational（or ON）、Failed（or OFF）、Detached。
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