问题
单项选择题
下列哪项关于可靠指标β与失效概率Pf之间的关系叙述是正确的。（）
A.可靠指标β愈小，失效概率Pf愈大
B.可靠指标β愈小，失效概率Pf愈小
C.可靠指标β愈大，失效概率Pf愈大
D.可靠指标β愈大，失效概率Pf不变
答案
参考答案：A
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下列哪项关于可靠指标β与失效概率Pf之间的关系叙述是正确的。（）
A.可靠指标β愈小，失效概率Pf愈大
B.可靠指标β愈小，失效概率Pf愈小
C.可靠指标β愈大，失效概率Pf愈大
D.可靠指标β愈大，失效概率Pf不变
参考答案：A
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| When I was a boy, every holiday that I had seemed wonderful. My 1 took me by train or by car to a hotel by the 2 . All day, I seem to remember, I 3 on the sands with strange 4 children. We made houses and gardens, and 5 the tide destroy them. When the tide went out, we 6 over the rocks and looked down at the fish in the rockpools. In those days the 7 seemed to shine always brightly 8 the water was always warm. Sometimes we left beach and walked in the country, 9 ruined houses and dark woods and climbing trees. There were 10 in one's pockets or good places where one could 11 ice-creams. Each day seemed a lifetime. Although I am now thirty-five years old, my idea of a good 12 is much the same as it was, I 13 like the sun and warm sand and the sound of 14 beating the rocks. I no longer wish to 15 any sand house or sand garden, and I dislike sweets. 16 , I love the sea and often feel sand running through my fingers. Sometimes I 17 what my ideal (理想中的) holiday will be like when I am 18 . All I want to do then, perhaps, will be to lie in bed, reading books about 19 who make houses and gardens with sands, who watch the incoming tide, who make themselves 20 on too many ice-creams.... | |||
| ( )1. A. teacher ( )2. A. sea ( )3. A. played ( )4. A. moving ( )5. A. made ( )6. A. rolled ( )7. A. light ( )8. A. and ( )9. A. exploring ( )10. A. sweets ( )11. A. make ( )12. A. house ( )13. A. hardly ( )14. A. waves ( )15. A. destroy ( )16. A.But ( )17. A. wonder ( )18. A. strong ( )19. A. children ( )20. A. happy | B. parents B. lake B. slept B. excited B. brought B. jumped B. sun B. yet B. examining B. sand B. sell B. holiday B. almost B. tides B. fix B. However B. feel B. weak B. boy B. tired | C. nurse C. mountain C. sat C. anxious C. watched C. turned C. moon C. but C. repairing C. ice-creams C. buy C. garden C. still C. hands C. use C. Otherwise C. understand C. young C. girls C. sad | D. younger sister D. river D. stood D. nervous D. heard D. climbed D. lamp D. or D. measuring D. money D. offer D. tide D.perhaps D. feet D. build D. Besides D. believe D. old D. grown-ups D. sick |