简述云闪电场的三个阶段

伴有呼吸困难的突发性胸部剧痛或绞痛常见于（）。

A.心肌梗死

B.心绞痛

C.肺栓塞

D.肺淤血

E.胸膜炎

Schoolgirls have been wearing such short skirts at Paget High School in Branston that they've been ordered to wear trousers instead. All skirts will be banned from September. Tight-fitting trousers will also be forbidden and Muslim head-dresses will have to be “school blue’’ color.

Head teacher Don Smith said, "One of the big problems for us at the school has been the number of girls who have been wearing inappropriately short skirts. This has been an area of particular concern at a time when there has been a lot of material nationally about the sexualisation of young people.”

He also said, “ It will be impractical to police the length of girls' skirts. A blanket ban will be easier for staff to put into practice. We did not want to arrive at a situation where we were telling girls their skirts could only be a certain number of centimeters above or below the knee. Pupils', parents' and other teachers' opinions were sought before the uniform rules were changed.，，

The new clothing policy has been explained in a letter sent to parents of the school's 1,000 pupils and will come into force after the summer holiday. Support will be given to parents unable to afford the new tie. The school also wants pupils to wear clip-on(夹式)ties instead of traditional neckties.

But the new uniform rules have not been well received by everyone. One parent, whose teenage daughter attends the school, said, “I completely agree some girls were wearing skirts that were too short. However, I think girls should be allowed to be feminine(女性化的).Other schools manage to let girls wear skirts while making sure they are not inappropriately dressed. I don't see why Paget can't do the same."

小题1:The girls at Paget High School are not allowed to wear skirts in that  _______.

A．short skirts give people the impression of sexualisation

B．short skirts are too expensive for parents to afford

C．the headmaster doesn't like girls wearing short skirts

D．the girls wearing short skirts will be at the risk of being laughed at小题2:We can learn from the passage that _______

A．the new uniform rules are well received by everyone

B．no schools in Branston allow girls to wear short skirts

C．parents unable to afford the new uniform will gain support

D．the pupils' parents were informed of the new clothing policy小题3:What's the attitude of Mr. Smith towards the new uniform rules?

A．Disagreeable.

B．Supportive.

C．Anxious.

D．Curious.小题4:What's the best title for the passage?

A．New School Rules Set

B．Girls' Skirts Forbidden

C．Traditional Neckties Gone

D．Different Opinions Voiced

双曲线与双曲线的离心率分别为e₁、e₂，则e₁+e₂的最小值为（）

A．4

B．

C．2

D．

随着学校的管理规模不断扩大，学生数量急剧增加，有关学生的各种信息量也成倍增长。学籍档案管理工作则变得更加复杂，档案的完整性、安全性等问题也显得更加重要，日益引起学校管理层的关注，需要有关学籍档案管理系统系统来提高学籍管理工作的效率。因此，学籍档案管理系统的开发也正是为了适应学校对变化的学生信息进行管理。学校希望开发一个学籍档案管理系统来满足管理的需要。

在管理信息系统开发过程中，产生一个包含下列内容的文档：“控制结构图及每一个模块的详细说明；计算机和网络配置说明；计算机处理过程说明；实施费用说明；用户界面设计说明；数据库设计说明；代码设计说明。”这个文档是（）。

A、系统分析报告

B、系统可行性报告

C、系统设计报告

D、系统验收报告

《维斯比规则》对《海牙规则》关于提单适用范围进行了修改，以下哪些属于《维斯比规则》的适用范围（）

A、任何国家

B、缔约国之间签发的提单

C、货物从缔约国起运的提单

D、不论在何地签发，只要提单上注明适用《海牙规则》的提单