已知等差数列{an}中,Sn是前n项和,若S16>0且S17<0,则当Sn最大时

题型:选择题

问题:

已知等差数列{an}中,Sn是前n项和,若S16>0且S17<0,则当Sn最大时,n的值为(  )

A.16

B.9

C.8

D.10

考点:等差数列的定义及性质
题型:选择题

推土机司机作业时安全注意事项有哪些?

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图为2010年5月上旬某日我国江南地区等压线分布图。读图回答下列各题。

小题1:若该日甲地出现了降水,其降水类型属于                        (   )

A.锋面雨

B.地形雨

C.台风雨

D.对流雨小题2:图中丁地可能出现的天气系统是                        (   )

A.反气旋

B.冷锋

C.暖锋

D.准静止锋小题3:从图中可以得出的正确信息是                   (   )

A.甲地是下沉气流

B.乙地是高气压中心

C.丙地风力最大

D.丁地降水在锋后

题型:选择题

青少年处于生长发育的关键时期,每天需要补充一定量的蛋白质.下面有关蛋白质在人体作用的叙述,不正确的是(  )

A.是构成人体细胞的基本物质

B.人的生长发育、组织更新离不开蛋白质

C.能为人的生理活动提供能量

D.是人体的主要供能物质

题型:选择题

下列哪项不会引起继发性脑干损伤()

A.癫痫

B.额颞部脑挫伤

C.脑水肿

D.颞叶血肿

E.小脑血肿

题型:选择题

In the last decade the mass media have grown worldwide to be larger, more influential and more powerful. After it was possible in the Federal Republic of Germany in the 60s to receive one TV program and in the 60s and 70s to receive three TV programs, the number of receivable TV programs has risen for a huge part of the population in western Europe through cable TV to eleven or even more programs in the last years. More TV channels are announced. Additionally there is the huge offer of videos. The distribution of video recorders in the population is increasing. Worldwide we are on the way to communication to a mass media society in which fiction, fantasy, the definition of reality assumes a greater role than reality itself, where people want to be permanently entertained, and where the description of the content gains more emphasis than the content itself.
For centuries news on crime have greatly attracted the population, In the Middle Ages ballad singers moved very successfully from town to town in order to spread their ballads which were to a great part murder stories. Criminal stories are not a new development because they do not report anything really new. They are regularly told according to the pattern of the "familiar sensation" because they have a function of relief for the society, because through them, the "law-abiding citizen" can set himself apart from the criminal, because they prove to him that his behavior is "normal" and because he can be content to feel that he is better than the criminals and that he successfully managed to escape the criminal act. There is a huge demand in the population for crime news because they are entertaining and remove the boredom of everyday life. The mass media willingly fulfill this demand because crime news are cheap and easy to get hold of and because they help sell almost any product. That is why there is a symbiosis, an unholy alliance between mass media and society against which the critical criminologist advances his objections almost in vain.

We are next to a mass media society because of the fact that ______.

A. we can pick up radio programs worldwide
B. a big population all over the world can have access to many a TV program and video recording
C. many people in Western Europe can receive at least eleven programs through cable TV
D. the newspapers worldwide are now playing a larger, more influential and powerful role than ever before

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