在流行病学实验中为防止偏倚常采用盲法,如果研究者、研究对象、负责资料收集和分析的人员

题型:单项选择题

问题:

在流行病学实验中为防止偏倚常采用盲法,如果研究者、研究对象、负责资料收集和分析的人员都不了解情况,则这种盲法称为

A.单盲

B.双盲

C.三盲

D.全盲

E.非盲

考点:卫生资格考试(中初级)全科医学主治医师流行病学方法(一)
题型:单项选择题

信号が 赤から 青————変わった。 

A.まで

B. と 

C. に

D.で

题型:单项选择题

曹操的选官政策是所谓“()”,曹丕实行的是“()”。

题型:单项选择题

下面哪个选项男性弱于女性()?

A.数学

B.体力

C.语言

D.空间能力

题型:单项选择题

汽包壁温差过大有什么危害?

题型:单项选择题

As an adult I choose to flip pages, not channels. After four years of not watching the tube and two years of not owning one, the empirical evidence is in: My life is better without a TV. Here’s why.

TV consumes an enormous amount of time

Let’s do the math. According to a 2009 Nielson study, the average amount of time an American spends watching TV is around five hours per day! Five hours! Excluding time spent sleeping, this means the average person is spending a third of their day distracted or downright comatose. By extension, this works out to more than 3.5 months (15 weeks) of nonstop TV watching each year.

(41)

TV news is a poor way to be informed

TV news justly receives much criticism. It has followed the path of professional wrestling: once genuine, yet now mostly for entertainment.

(42)

TV hinders the development of relationships

(43)

TV has too many commercials

The average 30 minute slot of television programming has 8~9 minutes of commercials.

(44)

TV isn’t that hard to get rid of

You might think, "I couldn’t possibly quit watching. "Firstly, you don’t need to. There are alternatives, including downloading the show or watching it on DVD, both of which offer stop/play control with no commercial interruptions. Secondly, it’s really not that hard to give up a show. They’re not like nicotine. There’s no chemical dependence.

(45) TVs are the last non-portable relic

For the most part we’ve managed to make our technology mobile.

Now, don’t get me wrong. I value entertainment and relaxation as much as the next person. There are shows I download and watch regularly, summing up to perhaps four hours per week. The truth is once you target a few specific shows and cut out commercials, there’s really not that much to watch.

So save time, learn something new, try something different, build your relationships, and for your own sake, turn off the TV.

[A] Sure you might get disappointed the first time you’re left out of a conversation about last night’s episode, but you can offset this disappointment by telling people about how you learnt to hang glide instead. I’ve liked a lot of TV shows but I’ve never seen one that wasn’t completely disposable at any given minute.

[B] Internet and phone services are available almost everywhere. TVs, in contrast, are like the coil-corded phones of the past, keeping people cooped up indoors, glued to the couch. A stationary TV sets encourages a sedentary lifestyle that seldom serves us well.

[C] Getting news from a rolling ticker (滚动新闻条) or a talking head is like going to a restaurant and waiting patiently to be served whenever the staff gets around to it. News should be ready on demand. With the Internet it is. With TV, you wait. If they have a story about a kitten caught in a tree, you endure it, lest you miss a minute of something that is actually relevant to you.

[D] Based on our earlier calculations, this can work out to more than a month each year spent watching advertisements. Books have no advertisements. Even ads on the Internet can quickly be ignored if they’re of no relevance. TV ads, in contrast, are time wasters that are forced upon you.

[E] At one point I was able to recount my favorite episode word by word. By watching these repeats you don’t even get to hear a unique joke or learn something new. TV reruns are time wasters, not only are you vegging out (慵懒发呆), you’re also not taking in anything novel.

[F] Time spent watching TV is time you’re not enjoying quality experiences with friends and family. Instead of tube time, try something new and out of the ordinary with the people in your life. Play billiards. Fly a kite. Or just talk to each other.

43()

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