给出下列不等式:①a2+3>2a;②a2+b2>2(a-b-1);③x2+y2>

题型:选择题

问题:

给出下列不等式:①a2+3>2a;②a2+b2>2(a-b-1);③x2+y2>2xy。其中恒成立的不等式的个数为[ ]

A.3

B.2

C.1

D.0

考点:不等式的定义及性质
题型:选择题

短文改错。

     文中共有10处语言错误,每句中最多有两处。错误涉及一个单词的增中、删除或修改。

增加:在缺词处加一个漏字符号(∧),并在其下面写出该加的词。

删除:把多余的词用斜线(\)划掉。

修改:在错的词下面划一横线,并在该词下面写出修改后的词。

注意:1. 每处错误及其修改仅限一词。 

          2. 只允许修改10处,多者(从第11处起)不计分。

     When Joe left university, he got a good work in a bike factory. But after he had been worked

there for some years, he decided to change. So he put notice in several newspapers, said what

experience he had and the kind of job he would like to have. One of the answers he accepted was

from a man was looking for a job, too. This man wrote to him. "Dear sir, when you get a new job,

be kind enough to give your name and address to your present boss as I have been trying to find a

position as yours for a long time." After he reads the letter, he suddenly realized that what he had

done was real foolish.

_______________________________________________________________________________

题型:选择题

患者女,50岁。间歇性牙龈出血1年。体检:双下肢可见散在的出血点及紫癜,肝、脾不大。血红蛋白120g/L,红细胞40×1012/L,白细胞5.5×109/L,分类正常,血小板15×109/L。

若骨髓象结果显示:巨核细胞数量增多,形成血小板的巨核细胞减少,可明确诊断为()

A.脾功能亢进

B.过敏性紫癜

C.ITP

D.急性白血病

E.再生障碍性贫血

题型:选择题

推理通常分为演绎推理和归纳推理。演绎推理即根据某种一般性原理和个别性例证,得出关于该个别性例证的新结论。归纳推理则从一定数量的个别性事实,抽象、概括出某种一般性原理。但更精确的说法是:演绎推理是必然性推理,即前提真能够确保结论真;归纳推理是或然性推理,前提只对结论提供一定的支持关系,前提真结论不一定真。

最能准确地体现这段话的本意的是()。

A.推理是研究个别与一般关系的科学

B.演绎推理是必然性推理,也是唯一可以用于指导实践的推理方式

C.这段文字概括了演绎推理和归纳推理的区别所在

D.推理实际上是人类认识自然的主要工具

题型:选择题

水利工程土石围堰漏洞险情进水口的探测方法有()等。

A.水面观察

B.潜水探漏

C.钎探

D.钻探

E.投放颜料观察水色

题型:选择题

不适用于《著作权法》的作品是( )。

A.时事新闻

B.工程设计图

C.产品设计图

D.地图

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