在等差数列{an}中,a1+a2+a3=12,a4+a5+a6=18,则a7+a

题型:填空题

问题:

在等差数列{an}中,a1+a2+a3=12,a4+a5+a6=18,则a7+a8+a9=______.

考点:等差数列的定义及性质
题型:填空题

通常高度每升高100米,气温下降()

A.0.55℃

B.0.65℃

C.0.75℃

D.0.85℃

E.1.00℃

题型:填空题

阅读理解

     People always think about "the problem of youth". If there is one-which I take leave to doubt-it is

older people who create it, not the young themselves.Let us get down to fundamentals and agree that

the young are after all human beings-people just like their elders.There is only one difference between

an old man and a young one:the young man has a beautiful future before him while the old man a

splendid future behind him and maybe that is where the rub is.

     When I was a teenager, I felt that I was just young and unknown-that I was a new boy in a huge

school, and I would have been very pleased to be regarded as something so interesting as a problem.

For one thing, being a problem gives you a certain identify, and that is one of the things the young are

busily engaged in seeking.

      I find young people exciting.They have an air of freedom, and they have not a dull promise to mean

ambitions or love of comfort.They are not anxious social climbers, and they have no devotion to

important things.All this seems to me to link them with life, and the origins of things.It's as if they were in

some sense of cosmic beings in violent and lovely contrast with us suburban (乡村的) creatures.All that

is in my mind when I meet a young person.He may be too proud, illmannered, selfconfident or selfsatisfied, but I do not turn for protection to boring clich?s about respect for elders as if age were a reason for

respect.I accept that we are equals, and I will argue with them, as an equal, if I think he is wrong.

1. "The problem of youth" in Paragraph 1 means the problem________.

A. caused by young people

B. needed to be solved by young people

C. young people meet

D. created by the old for the young

2. The underlined word "rub" is closest in meaning to________.

A. fact

B. age

C. future

D. difficulty

3. One of the things the young are engaged in is that they want to________.

A. climb up the social ladder

B. have freedom

C. be known

D. make troubles

4. By saying "anxious social climbers", the writer refers to________.

A. some mean adults

B. ambitious young people

C. capable political leaders

D. people who pursue comfort

题型:填空题

男性 * * 分泌物检查淋球菌的首选方法是涂片革兰染色法。 ()

题型:填空题

下列有关最高额抵押合同的说法中,不正确的是()。

A.最高额抵押权设立前已经存在的债权,不能转入最高额抵押担保的债权范围

B.抵押权人实现最高额抵押权时,如果实际发生的债权余额高于最高限额的,以最高限额为限,超过部分不具有优先受偿的效力

C.最高额抵押担保的债权确定前,部分债权转让的,当事人可以约定最高额抵押权随之转让

D.抵押财产被查封、扣押时抵押权人的最高额抵押对应债权确定

题型:填空题

站内机车信号一个半黄半红色灯光,且监控装置数据将该出站信号机已设置为“大秦发码特殊信号机”,运行速度低于30km/h,距信号机距离小于()m时,按压【解锁】、【确认】。

A.200

B.300

C.400

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