不等式2x2+2x-4≤12的解集为 ______.

题型:填空题

问题:

不等式2x2+2x-4
1
2
的解集为 ______.
考点:指数函数模型的应用一元高次(二次以上)不等式
题型:填空题

阅读理解。

     Perhaps you have heard a lot about the Internet, but what is it?

     The Internet is many different networks around the world. A network is a group of computers put together. These networks joined together are called the Internet.

     Maybe that doesn’t sound interesting. But when we’ve joined the Internet, there are lots of things we can do. We can find lots of interesting information on the World Wide Web(www). We can use the Internet instead of a library to find all kinds of information for our homework. We can find information about our favourite sports or film stars and do shopping on the Internet. We can also send messages to other people by e-mail. It is much cheaper and quicker than calling our friends or sending a letter.

     Thanks to the Internet, the world is becoming smaller and smaller. People can now work at home with a computer in front of them, getting and sending the information they need. They can buy or sell whatever they want by the Internet. But do you know 98%of the information is in English? So what will English be like tomorrow?

1.The passage is mainly about_______.

A. the Internet

B. information

C. computers

D. e mail

2.The quickest and cheapest way for people to send messages to their friends is_______.

A. by postB. by e-mailC. by telephoneD. by TV

3.The Internet cannot be used to_______.

A. find information for our homework

B. get some information about our favourite sports stars

C. do some shopping

D. do our housework

4.Which of the following is NOT true?

A. The Internet is a big computer.

B. The Internet is lots of computer networks.

C. The Internet is very helpful.

D. People can work at home with the help of the Internet.

5. What does the writer try to tell us with the last two sentences?

A. The Internet is more and more popular.

B. All the information is in English.

C. English is important in using the Internet.

D. Every computer must join the Internet.

题型:填空题
ω=-
1
2
+
3
2
i
,则等于ω42+1=______.
题型:填空题

诊断思维的基本原则不正确的是()

A.首先应考虑器质性疾病

B.应当考虑当地流行和发生的传染病与地方病

C.首先考虑常见病与多发病

D.首先应考虑可治性疾病

E.尽可能用多种疾病去解释多种临床表现

题型:填空题

关于处女膜破裂,下列说法正确的是()。

A.外伤导致的处女膜破裂比较规则

B.性交引起的处女膜破裂多在4点和8点处

C.处女膜破裂较重者,宜剥离 * * 口两侧的部分粘膜

D.处女膜孔以能容纳一小指尖为度

E.术前2日每天冲洗 * *

题型:填空题

线路上的伤损钢轨应用白铅油作好标记,连续轻伤有发展的标记是()。

A.I←△→I

B.I←△△→I

C.↑△

D.↑△△

更多题库