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[主观题]

同一生产条件下生产的一批电子元件,任意抽取一件测试其寿命,事件A=“测得时间小于1 800小时”,事件

B=“测得时间大于1 000小时”,A∩B等于 ()。

A.{x:x>1 000}

B.{x:x>1 800)

C.{x:1 000D.{x:x<1 800)

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更多“同一生产条件下生产的一批电子元件,任意抽取一件测试其寿命,事件A=“测得时间小于1 800小时”,事件”相关的问题

第1题

Last night, a fire broke out in Ann&39; s house in Manchester.Ann&39; s ——21 were out of t

Last night, a fire broke out in Ann&39; s house in Manchester.

Ann&39; s ——21 were out of town for the weekend when something wrong in the room caused the fire to start in the middle of the night. The ——22 was waken up by the family dog, Danny, who was barking loudly in the back garden. Ann smelled something ——23 . She ——24 and ——25 ran through the smoke-filled house to wake her old brother, Frank.

When Frank would not wake up, Ann got some help from the dog. Frank&39; s unconscious body was far too ——26 for the little girl to move alone, but the ——27 girl brought the dog ——28 and tied the dog&39; s lend to Frank&39; s left ankle. She then held her brother’s right ankle, and together the girl and the dog ——29 Frank to safety. The 10 year-old girl, Ann, ——30 her big brother from death.

21. A. parents B. brother and sister C. friends D. classmates

22. A. child B. boy C. girl D. dog

23. A. delicious B. bad C. burn D. burning

24. A. stand up B. wake up C. get up D. put up

25. A. at once B. at first C. at last D. at the moment

26. A. big B. small C. light D. heavy

27. A. careless B. busy C. clever D. careful

28. A. inside B. outside C. back D. near

29. A. pushed B. pulled C. carded D. made

30. A. was received B. get C. was saved D. saved

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第2题

—Can you tell me anything about the fire ______ last night?—I'm afraid, ______A.taking pla

—Can you tell me anything about the fire ______ last night? —I'm afraid, ______

A.taking place, a little

B.that broke out, very little

C.broke out, just a little

D.happened, quite a few

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第3题

When Ben’s house ws on fire lst night, severl neighbors rushed to hisnd put out the fire.e
xpeWhen Ben’s house ws on fire lst night, severl neighbors rushed to hisnd put out the fire.expecttion B.bsence C.ssistnce D.requirement

A.expectation

B.absence

C.assistance

D.requirement

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第4题

The big fire broke out in the night, ______ great damage to the nearby towns.A.causingB.ca

The big fire broke out in the night, ______ great damage to the nearby towns.

A.causing

B.caused

C.to cause

D.to be causing

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第5题

-Professor Brown looks sad today.-He is sad. Yesterday a fire broke out in his house and h

-Professor Brown looks sad today.

-He is sad. Yesterday a fire broke out in his house and his dog got______.

A.burnt

B.to burn

C.burning

D.to be burnt

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第6题

听力原文:W: Jack, have you seen the news on the paper? Last night, a fire broke out in the
building just opposite to our street block I don't imagine you would help me out if that would happen.

M: As it happened, I would. You count on me!

Q: What is the worry of the woman?

(13)

A.The fire will break out.

B.The man would forget to help her out.

C.The man hasn't read the newspaper.

D.The building is just in the opposite street block.

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第7题

Late last night, a fire ______ in a hotel near where I live.A.broke offB.broke forthC.brok

Late last night, a fire ______ in a hotel near where I live.

A.broke off

B.broke forth

C.broke in

D.broke out

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第8题

The fire that_____ yesterday caused at least ten people's death.

A.broke off

B.broke up

C.broke down

D.broke out

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第9题

Late last night, a fire ______ in a hotel near where I live.A.broke offB.broke forthC.brok

Late last night, a fire ______ in a hotel near where I live.

A.broke off

B.broke forth

C.broke in

D.broke out

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第10题

What did the man probably do last night?A.Watch TV.B.See some friends.C.Go out for dinner.

What did the man probably do last night?

A.Watch TV.

B.See some friends.

C.Go out for dinner.

D.Buy a watch.

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