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【单选题】
什么叫做低压电器的电寿命？（）
A.
电寿命就是低压电器在正常工作条件下最长的工作时间。反映了低压电器内部各个零部件在协调配合方面的最大极限工作能力
B.
电寿命就是在规定的正常工作条件下，开关电器的机械部分在无需修理或更换零件（一次触头）的条件下负载操作循环的次数
C.
低压电器的电寿命就是在当出现极限工作状态后仍然能够继续工作的最长时间
D.
从开始运行到电器报废的最长时间
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