问题 问答题 简答题

孤立档在运行中有何优点?施工中有何缺点?

答案

参考答案:

按题意分述如下。

(1)运行优点:

1)可以隔离本档以外的断线事故。

2)导线两端悬点不能移动,垂直排列档距中央线间距离在不同时脱冰时能得到保障,故可使用在较大档距。

3)杆塔微小的挠度,可使导线、避雷线大大松弛,因此杆塔很少破坏。

(2)施工中的缺点:

1)为保证弧垂能满足要求,安装时要根据杆塔或构架能承受的强度进行过牵引。

2)孤立档档距较小时,绝缘子串下垂将占全部弧垂一半甚至更多,施工安装难度大。

阅读理解

FOR Chinese students the end of their senior year is filled with studying and stress as they prepare for the college entrance exams in June.But for American high school seniors the experience couldn’t be more different. The end of senior year is a celebration of their time in high school and involves parties,games and fun.

Senioritis is a commonly used expression.It means seniors have a disease which makes them unable to do work.This starts in April when seniors find out whether they have been accepted to university.

Unwilling to do school work,seniors have plenty of other activities to focus on.

Many schools have a “Senior Show”,in which only seniors are allowed to perform.Some seniors sing or dance but many of them perform skits(滑稽短剧),where they make fun of their favorite teachers or their friends.For example,a group of boys may dress up and imitate a group of their friends.It is all light-hearted.

The“Senior Show”is usually a part of Senior Week,which is a week specifically dedicated(专用的) to seniors.During this week,seniors usually get academic or athletic awards they have won over their high school careers.The seniors also vote for one of their male and female classmates who they believe is the best-looking or funniest or most involved,etc.These are then published in the yearbook.

The yearbook is an important part of high school for seniors.It is usually dedicated to them and has all their pictures and some words from them in it.Then seniors go around and get it signed by their friends so they can always remember their time together.

Of course during all of this time,seniors are preparing for the Senior Prom,which is an important moment in American culture.It is the most important dance in a young American’s life.

The end of senior year is a truly special and wonderful time for American students.It’s something they will remember for the rest of their lives.

60.Which of the following is the closest in meaning to the underlined sentence in paragraph1?

A.For American high school seniors,things are quite different.

B.It doesn’t make difference at the end of the senior year.

C.For American high school seniors,it is the best time of the year.

D.It is the period filled with stress and workload.

61.What activities that seniors would like to do according to the passage?

A.School work                       B.Voting for the film star

C.Singing or dance contests             D.Senior Show and Senior Prom

62.What will most probably be talked about in the next paragraph of the passage?

A.Activities on the sports field

B.The graduation ceremony where they receive their high school diploma

C.Their favorite film stars

D.The health of seniors

判断题