如图所示,用一块轻塑料片挡住两端开口的玻璃筒下端,竖直插入水中并使塑料片距水面2

题型:选择题

问题:

如图所示,用一块轻塑料片挡住两端开口的玻璃筒下端,竖直插入水中并使塑料片距水面20cm,然后向玻璃筒内缓慢注入酒精(酒精密度为0.8x103kg/m3),当塑料片恰好下落时,注入酒精的高度为    (    )

A.20cm

B.16cm

C.25cm

D.24cm

考点:液体压强的计算
题型:选择题
A new study suggests that the more teenagers watch television, the more likely they are to develop depression (抑郁症) as young adults.
The researchers used a national long-term survey of healthy young teenagers of about 13—16 to find out the relationship between media(媒体) use and depression. They based their findings on more than 4000 young teenagers who were not depressed when the survey began in 1995.
As part of the survey, the young people were asked how many hours of television or videos they watched daily. They were also asked how often they played computer games and listened to the radio. Here was the result. The young people spent five and a half hours a day using media and more than 2 hours of that was spent watching TV.
Seven years later, in 2001, more than 7% of the young people had signs of depression. The average age at that time was 21. Brian Primack at the University of Pittsburgh medical school was the lead author of the new study. He says every extra hour of television meant an 8% increase in the chances of developing signs of depression.
The researchers say they did not find any such relationship with the use of other media such as movies, video games or radio. But the study did find that young men were more likely than young women to develop depression given the same amount of media use.
Doctor Primack says the study did not find out if watching TV causes depression directly. But one possibility, he says, is that it may take time away from activities that could help prevent depression, like sports and social activities. It might also prevent a person from sleeping well, he says, and that could have an influence.
The study was just published in the Archives of General Psychiatry.
In December, the journal Social Indicators Research published a study of activities that help lead to happy lives. Researchers from the University of Maryland found that people who describe themselves as happy spend less time watching television than unhappy people. The study found that happy people are more likely to be socially active, to read, attend social services and to vote.
Process of the study
Details
The purpose of the research
To find out   小题1: between media use and depression
At the beginning of the research
 小题2:was made among over 4000 young people who were not depressed.
The result of the survey
These young people spent five and a half hours a day in using media and they spent over 2 hours or that  小题3:
Seven years later
Researchers found 7% of the young people had a sign of depression. Every extra hour of watching TV meant an 8% increase in the chances of developing signs of depression.
Results of the study
1. Watching TV might have   小题4:   and it may take time away from activities and sports.
2. Young men get more chance than young women to develop depression.
3. The reason some people get depression is that   小题5: 
题型:选择题

有关双腔气囊三腔管的护理,正确的是()

A.插入三腔管后先向食管气囊注气

B.置管期间唾液可随时咽下

C.胃气囊注气量为100~150ml,食管气囊注气量为200~300ml

D.放置48小时后,出血停止,放气观察12小时后无出血同拔管

E.拔管前从胃管内注石蜡油20~30ml

题型:选择题

按照射野输出因子(OUT)的定义,它相当于是()。

A.准直器散射因子Sc

B.模体散射校正因子Sp

C.总散射校正因子Sc,p

D.辐射权重因子ωR

E.楔形因子Fw

题型:选择题

依据《天津市养老服务促进条例》规定,养老服务发展应当坚持()的原则

A.政府主导、政策支持、社会参与、统一运作

B.党委主导、政策支持、社会参与、分级运作

C.政府主导、政策支持、社会参与、市场运作

D.党委主导、政府支持、社会参与、市场运作

题型:选择题

H2S和SO2在液硫中的溶解度随温度升高而上升

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