问题
问答题 简答题
威布尔分布形状参数m的变化对故障率的影响。
答案
参考答案：
由失效率函数λ（t）的表达式可知：当m=1时，故障率恒定，即为指数分布。当m<1时，λ（t）为单调递减函数，它描述了递减型的早期故障期。当m>1时，，λ（t）为单调递增函数，它描述了递增型的耗损故障期。当m=3~4时非常接近正态分布。
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威布尔分布形状参数m的变化对故障率的影响。
参考答案：
由失效率函数λ（t）的表达式可知：当m=1时，故障率恒定，即为指数分布。当m<1时，λ（t）为单调递减函数，它描述了递减型的早期故障期。当m>1时，，λ（t）为单调递增函数，它描述了递增型的耗损故障期。当m=3~4时非常接近正态分布。
| 阅读理解 | |||||||||||||||||||||||||||||
The Timetable of Alice on Monday
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| 1. What time does Alic have math? | |||||||||||||||||||||||||||||
| A. From 8 :30 t0 9:30. B. From 9 :40 t0 10 :40. C. From 10:50 t0 11 :50. D. From l:30 t0 2:30. | |||||||||||||||||||||||||||||
| 2. What subject does Julia Hand teach? | |||||||||||||||||||||||||||||
| A. English. B. Math. C. History. D. Art. | |||||||||||||||||||||||||||||
| 3. Alicia doesn't like math because it's_________. | |||||||||||||||||||||||||||||
| A. boring B. difficult C. funny D. easy | |||||||||||||||||||||||||||||
| 4. ___________ is Alicia's P. E. teacher. | |||||||||||||||||||||||||||||
| A. Helen Smith B. Dale Green C. Mona Miller D. Liu Wei | |||||||||||||||||||||||||||||
| 5. Which of the following is WRONG(错误的) ? | |||||||||||||||||||||||||||||
| A. Li Tao is an English teacher. B. Julia Hand thinks art is interesting. C. Alicia likes P. E. D. Alicia has six classes on Monday. |