四边形ABCD各顶点的坐标分别为A(1,3)、B(5,2)、C(8,4)、D(6

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问题:

四边形ABCD各顶点的坐标分别为A(1,3)、B(5,2)、C(8,4)、D(6,9),以原点为位似中心,相似比为
1
2
的位似图形A1B1C1D1,且四边形A1B1C1D1在第一象限.写出各点坐标.
考点:位似用坐标表示位置
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营养性缺铁性贫血的患儿最主要的特点是

A.小细胞低色素性贫血

B.大细胞低色素性贫血

C.正细胞低色素性贫血

D.大细胞高色素性贫血

E.小细胞高色素性贫血

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如图所示,电感线圈L的直流电阻RL=1Ω,小灯泡A的电阻R=5Ω,闭合开关S,待电路稳定后再断开开关,则在断开开关S的瞬间,小灯泡A:

A.立即熄灭

B.闪亮一下再逐渐熄灭

C.逐渐熄灭

D.以上三种情况都有可能

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Unknown to most Facebook users, the social network actually offers a lot of privacy controls and security features which can help you lock your account, so you can speak freely. If it’s used properly, you’ll never have to worry about whether you will have to “friend” your boss or your mom. You can friend anyone you want while staying comfortable in the knowledge that not everyone gets to see everything you post.

The problem with carrying out these privacy options is that they’re just too confusing for most non-tech clever people to handle. And often, most people don’t want to bother to take the time to learn. To simplify the process, we’re offering one easy step you can take today to help make your Facebook experience safer, more secure, and more private.

Just make “Friend Lists”. Yes, it will take some time, especially if you’re connected to a couple of hundred friends already. But this step, while not the quickest, is fairly simple. And it will be one of the most useful things you can do on Facebook.

Friend lists, as the name suggests, are lists for classifying your friends into various groups. The nice thing about this feature is that once you set these lists up, you won’t have to do it again. We suggest that you put your work colleagues and professional acquaintances into a friend list named “Work”, personal friends you’re not very close with into a list called “Acquaintances”, and people you’re related to into a list called “Family”. Those three main categories will separate out the groups of “friends” who you may want to hide some information from.

To create a friend list, click on “Friends” at the top of the Facebook homepage. In the left-hand column, click “Friends” again under the “Lists” section. Now you’ll see a button at the top that says “Create New List”. Click it. In the pop-up that appears, you can name your list and pick members. If you’ve ever shared an application with your friends, the process of doing this will be very familiar.

When you’ve finished making lists, you’ll be able to use them when selecting who can see what (or who can’t!) when configuring (配置) the security settings described below.

小题1:What function isn’t understood by most people on Facebook?

A.Surfing the Internet.

B.Setting safety protection.

C.Sharing personal information.

D.Making foreign friends.小题2:What can we learn about Facebook according to the text?

A.Its process of privacy-setting is too complex.

B.It displays everything people post.

C.It lacks privacy controls and security features.

D.Its post is designed for technical people.小题3:What advantage can we get from making friend lists?

A.We can avoid our bosses adding us as friends.

B.We can share applications with friends.

C.We can separate acquaintances from family.

D.We can hide different information from different friends.

题型:解答题

福利国家型保障模式是最早出现的社会保障制度。

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平板工件X射线照相,若透照厚度比满足1.1,则透照一次的有效长度可用()式计算(式中:L-透照有效长度;F-焦距)

A、L=2(0.21)1/2F

B、F=2(0.21)1/2L

C、L=2(0.21F)1/2

D、L=(0.21)1/2F

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