在等差数列{an}中,a5=0.3,a12=3.1,求a18+a19+a20+a

题型:解答题

问题:

在等差数列{an}中,a5=0.3,a12=3.1,求a18+a19+a20+a21+a22的值.

考点:等差数列的前n项和
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同业拆放利率CHIBOR的期限是从隔夜到七天、二十天,从一个月到四个月,在每个交易日形成相应的利率期限结构曲线,曲线可以呈现出( )形态。 Ⅰ.水平型 Ⅱ.上升型 Ⅲ.下降型 Ⅳ.驼峰型

A.Ⅰ、Ⅱ、Ⅲ

B.Ⅱ、Ⅲ、Ⅳ

C.Ⅰ、Ⅱ、Ⅳ

D.Ⅰ、Ⅱ、Ⅲ、Ⅳ

题型:解答题

新中国建立初期至完成对私营进出口商社会主义改造时期我国对外贸易管理的主要特点为( )

A.管理目的不明

B.管理目的明确

C.管理方法比较简单

D.管理比较严格

E.管理制度完善

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This was one of my experiences (1) . When I was in my 30s, I was working for a large international company which had its head office in London. I was working in the (2) department.
The company had a training centre which was just outside London. Different courses were held there throughout (3) and I (4) go on one training course a year. These usually started (5) a Sunday evening and lasted six days.
Once I was (6) a week’s training course with about forty (7) sales people. I was in the bar on the Friday evening and suddenly a woman who was (8) behind the bar asked mea curious question. "I hope you don’t (9) my asking," she said, "but I’ve been (10) about it all week. Have you got a sister (11) Mary" The woman’s name was June. And she used to do various jobs at the training centre. She worked in the office, she organized all the food and drink for the centre and she worked in the bar at lunchtime and in the evening.
My answer (12) June’s question was "Yes", and June said, "I thought (13) . I met her last September when she was organizing a course here. " At that time, my sister was working for (14) company but in a different part of the country. That was (15) she came to be at the training centre.
(16) surprised me was how June guessed we were brother and sister. Three things made it even more (17) . First, she had met my sister six months before she met me. Second, they have about sixty new people every week at the training centre. So about one thousand five hundred people had (18) the centre in those six months. And (19) , my sister is married, so she doesn’t have the same family name as me.
We’re not (20) , but I guess we must look quite like each other.

A.called
B.calling
C.calling on
D.calling up

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对危重新生儿最可靠的给药方式是

A.口服给药

B.直肠给药

C.静脉给药

D.皮下注射

E.肌肉注射

题型:解答题

功率因数是指()与()之比,它表明电路对电源提供功率的利用率。

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