设an为数列,A为定数。对于“对任意ε>0,存在正整数N,当n>N时,有|an-A|

题型:单项选择题

问题:

设an为数列,A为定数。对于“对任意ε>0,存在正整数N,当n>N时,有|an-A|<ε”的否定(即

)是()。

A.存在ε>0,对任意正整数N,存在n>N,使得|an-A|≥ε

B,对任意ε>0,存在正整数Ⅳ,当n>N时,有|an-A|≥ε

C.对任意ε>0,以及任意正整数N,当n>N时,有|an-A|≥ε

D.存在ε>0,存在正整数N,存在n>N,有|an-A|≥ε

考点:教师资格考试其它考试科目(A)教师资格认定考试高级中学数学真题2012年下半年
题型:单项选择题

火车以 70km/h 的速度通过一段距离,子弹以 600m/s 的速度从枪口射出,则(  )

A.70km/h是平均速度

B.70km/h是瞬时速度

C.600m/S是平均速度

D.600m/s是瞬时速度

题型:单项选择题
根据英文选择恰当的汉语释义。
( ) 1. What's your father?
( ) 2. My mother is a doctor.
( ) 3. What's your mother?
( ) 4. She's a teacher.
( ) 5. I'm a student.
A. 我是一名学生。
B. 我的妈妈是一名医生。
C. 你的妈妈是干什么工作的?
D. 你的爸爸是干什么工作的?
E. 她是一名老师。
题型:单项选择题

I had made up my mind a long time ago that I would not give a homeless person money, because I could never be sure what that money would be used for. Instead, I decided, I would buy them a sandwich, a cold drink on a hot day, a cup of coffee, whatever I could manage.

I was out recently and saw a homeless man outside of a Starbucks. I decided I would buy this man lunch. I bought a sandwich and soda.

Just as I was leaving the store, two policemen were approaching the man. Obviously the shop owners had complained of his wandering and the police were there to draw him away from the storefronts. Just as they were about to wake him, I asked one of the officers if it was all right if I just gave the man something before he went. I was not sure why I asked the permission but the policeman said sure and I just left the bag in the man’s cart, got in my car and drove off.

As I was driving off I remember thinking “I hope people saw that”. Then I had to seriously ask myself why I hoped people had seen me give the man a sandwich from Starbucks. Was it because I wanted people to think, “She’s such a nice person!”? Why did I hope others had seen me do it? I continued to wonder this all evening.

The next morning, it came to me that I wanted people to have witnessed that small act of kindness not so that I would receive credit and praise but so that they might be inspired to do the same and in so doing that others still would witness their acts of kindness. Thus the whole spirit of pity and giving would be lasting.

小题1:The underlined word “Starbucks” in the second paragraph is the name of a _________.

A.shop

B.bookstore

C.bank

D.man小题2:When the author saw the homeless man, he was __________.

A.begging outside

B.buying goods

C.staying awake

D.falling asleep小题3:What’s the purpose of the passage?

A.To show the author is great.

B.To encourage people to help others.

C.To introduce an experience that changed the author.

D.To call on people not to give money to a homeless man.小题4:The author can be best described as __________.

A.bad-tempered

B.hard-working

C.kind-hearted

D.self-confident

题型:单项选择题

关于滤池反冲洗的供给,下列叙述有误的一项是()。

A、滤池反冲洗水由高位水箱或专设的冲洗水泵供给

B、高位水箱供给冲洗水操作简单,允许在较长的时间内向水箱供水,因而使用的水泵较小,电耗均匀,对厂区用电均匀性影响较小

C、专设的冲洗水泵供水,虽然建造费用低,可连续冲洗几个滤池,冲洗强度比较均匀,但其操作麻烦,在反冲洗这一较短的时间段内耗电量较大,往往会造成厂区内供电系统负荷骤增

D、在有地形或其他条件可以利用时,还是偏重于应用水泵冲洗

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