已知f1(x)=sinx+cosx,fn+1(x)是fn(x)的导函数,即f2(

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问题:

已知f1(x)=sinx+cosx,fn+1(x)是fn(x)的导函数,即f2(x)=f1(x),f3(x)=f2(x),…,fn+1(x)=fn(x),n∈N*,则f2011(x)=(  )

A.sinx+cosx

B.sinx-cosx

C.-sinx+cosx

D.-sinx-cosx

考点:导数的运算
题型:选择题

假定英语课上英语老师要求同桌之间互相修改作文,请你修改你同桌的以下作文。

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加、删除或修改。

删除:把多余的词用斜线(\)划掉。

增加:在缺词处加一个漏字符号(/\),并在该词下面写出该加的词。

修改:在错的词下划一横线,在该词下面写出修改后的词。

注意:1.每处错误及修改均仅限一词。

2.只允许修改10处,多者(从11处起)不计分。

3. 修改格式错误不得分。

The main purpose of newspapers is to provide news. If you examine newspapers closely, you would find that there are all sort of news: accidents, floods, fires, wars, sports, books, etc. The news cover everything what happens to people and their surroundings. Sometimes there are news items which are very interested. A news report is usual very short, except for when it is very important, but it has a lot of information. It is also writing in short paragraphs. The first paragraph is in fact summary of the news items. He gives all the necessary information, what, when, where, how, and why.

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下列何项不是吴茱萸汤的主治证()。

A.胃中虚寒,浊阴上逆证

B.虚劳里急,诸不足证

C.厥阴头痛证

D.少阴吐利证

E.虚寒呕吐

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禁止在电流互感器与临时短路点之间进行工作。

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原发性高血压的治疗目的是()

A.彻底根治

B.将血压控制在正常范围内

C.减少心血管并发症的发生率

D.减少脑卒中的死亡率

E.以上都是

题型:选择题

下列哪一项不属于膳食纤维()

A、糊精

B、果胶

C、木质素

D、纤维素

E、半纤维素

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