单选题在故障率规律曲线上,早期故障期的特点是()。 1.故障率高; 2.故障率低; 3.随便用时间延长迅速上升; 4.随便用时间延长迅速下降; 5.与使用时间无关。A1+3+5B1+4C2+3+4D3+5
单选题
在故障率规律曲线上,早期故障期的特点是()。 1.故障率高; 2.故障率低; 3.随便用时间延长迅速上升; 4.随便用时间延长迅速下降; 5.与使用时间无关。
A
1+3+5
B
1+4
C
2+3+4
D
3+5
参考解析
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