已知关于x的方程(a2-4a+5)x2+2ax+4=0 (1)当a=2时,解这个

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问题:

已知关于x的方程(a2-4a+5)x2+2ax+4=0

(1)当a=2时,解这个方程;

(2)试证明:无论a为何实数,这个方程都是一元二次方程.

考点:一元二次方程的定义一元二次方程的解法
题型:解答题

人造纤维制其他针织或钩编织物

题型:解答题

读写任务。

阅读下面的短文,然后按照要求写一篇150词左右的英语短文。

     "Depend on yourself"is what nature says to everyone. Parents can help you. Teachers can help you. Others

still can help you. But all these only help you to help yourself.

     There have been great men in history. But many of them were very poor in childhoods and no uncles, aunts

or friends to help them. Schools were few and not very good. They could not depend upon them for an

education. They saw how it was, and set to work with all their strength to know something. They worked their own way up to fame.

     One of the most famous teachers in England used to tell his pupils. "I can not make worthy men of you but

I can help you make men of yourself."

     But some young men tend to totally depend on others to help them out. They can never achieve much

unless they see their weak points and change their course. They are nothing now, and will be nothing as long as

they live, unless they accept the advice of their parents and teachers and depend on their own honest efforts.

     [写作内容] 1)以约30词概括短文的要点;

                            2)然后以约120词就“一切靠自己”的主题发表看法,并包括以下要点:

     a)表达你的论点;

     b)陈述你的理由;

     c)概括你的论点:应该如何依靠自己。

     [写作要求]可以使用实例或其它论述方法支持你的论点,也可以参照阅读材料的内容,但不得直

接引用原文中的句子。

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题型:解答题

处方中"单位"的缩写词是()

A.U

B.IU

C.co.

D.UI

E.UD

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什么是暂时迂回路由(TAR)控制?

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船舶发生重大事故、大事故和重大事故隐患,船长应将情况()报告船舶所属单位的机务部门和高度部门。

A.5日内

B.10日内

C.5日内

D.尽快

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