设α1,α2,α3,α4是n(n>3)维列向量,已知α1,α2,α3线性无关,非零向

题型:单项选择题

问题:

设α1,α2,α3,α4是n(n>3)维列向量,已知α1,α2,α3线性无关,非零向量α4与α1,α2,α3都正交,则下列结论
①α1,α2,α3,α4线性相关 ②α1,α2,α3,α4线性无关
③α4可由α1,α2,α3线性表出 ④α4不可由α1,α2,α3线性表出
中正确的是

A.①、③.

B.①、④.

C.②、③.

D.②、④.

考点:普通考研考研数学(一)考研数学一
题型:单项选择题

按第三军医大学补液公式,第2个24小时补电解质液和胶体液皆为第1个24小时的()

A.1/2

B.1/3

C.1/4

D.3/5

E.2/3

题型:单项选择题

阅读理解。

     Don't believe all of the stereotypes(模式化的形象)you may have heard about Americans.

Even the ones that are true in general may not be true about specific individuals or a large part

of the population.For example,although Americans tend to be louder than people from other

cultures(especially at athletic events),many of the people you meet will be quiet and polite.Some

people may be intolerant, but most will be pleasant and welcoming.Remember that American

films and television exaggerate(夸张)in order to generate excitement, and so present a rather

false picture of what life in the United States is really like.Therefore,tourists in the US are not

always on their best behavior.

     Americans do tend to be more informal than people from other countries.It is common for

Americans to wear casual clothing to school and to greet professors by first name.However,

good manners and politeness are always appreciated.If you are polite, and dress a little more

formally than your American friends, it will not be poorly thought of.

     However,some businesses require their employees to wear a uniform or a suit.It would be

improper to wear a Tshirt and blue jeans to a job interview.Some of the more prestigious

restaurants require a coat and a tie.Americans tend to dress up for cultural events(the opera,

theater and ballet)and to dress down for athletic events.Formal wear is required at weddings

and funerals, or any other event with religion.If you rely on the stereotypes,you will likely put

yourself into an embarrassing situation.

1. The underlined sentence probably means________.

A.some of the stereotypes you may have heard about Americans are not true

B. you should not believe the stereotypes you may have heard about Americans

C. none of the stereotypes you may have heard about Americans should be believed

D. none of the stereotypes you may have heard about Americans should not be believed

2.The passage is probably written for________.

A.businessmen  

B. visitors to America

C. American students  

D. American filmmakers

3.The second paragraph suggests that________.

A.most Americans are polite

B. people who are polite are welcome

C. casual clothing makes others uncomfortable

D. American students are impolite to their teachers

4.We can learn from the passage that________.

A.American films are mostly poor comedies

B. it is good manners to wear blue jeans to a wedding

C. Americans usually wear formal clothes in a theater

D.to dress formally makes others feel you are not easy to get on with

题型:单项选择题

下列选项中不能成为普通合伙人的是()

A.国有独资公司

B.国有企业

C.上市公司

D.公益性的事业单位

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简述票据取得与票据权利取得的关系是什么

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领导班子换届,民主推荐由上级党委(党组)主持。

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