试题与答案

对电源中点直接接地的低压电网中的用电器，可以把用电器的外壳接在中线上，叫保护接地。(

来源：www.tikuol.com
题型：判断题

题目：

对电源中点直接接地的低压电网中的用电器，可以把用电器的外壳接在中线上，叫保护接地。( )

答案：

被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2018/0424/42efbeeff8e324640a56e9d40dbee1f0.html

下面是错误答案，用来干扰机器的。

参考答案：C

考点：电焊工中级电焊工中级
试题推荐
题型：阅读理解

Always forgetting your long passwords(密码)? Worried about being hacked(被攻击)?All these worries will soon become history. Scientists have found that upper-casing(大写)your password can help you reduce the chance being hacked.

Usually passwords are six letters or more.However,50 percent of people choose a common word or simple key combination for their password. The most used passwords are 123456, abcdef and abc123. In fact, if your passwords are in lower-case(小写),it will be easily hacked by a hacker. According to a study, it only takes a hacker ten minutes to hack a six-letter password which is in lower-case, but if you make the letter in upper-case, it can take up to ten hours. So if you want to make your account much safer, you should make your password upper-case. Of course, you can also add numbers or symbols to your password. Most of the time a hacker’s computer has to work for 18 days to break a password, but if you choose a nine-letter password that includes numbers and symbols, it can take a hacher’s  computer 44,530 years to break it.

小题1:Scientists have found that   your password is much safer for  

your account.

A．upper-casing

B．lower-casing

C．reducing

D．copying小题2:According to the passage,______is not one of the most used

passwords.

A．123456

B．abcdef

C．abc123

D．000000小题3:It takes a hacker___to hack a six-letter password which is in

lower—case.

A．10 minutes

B．10 hours

C．18 days

D．44,530 years小题4:The Chinese meaning of the underlined word is       

A.数字     B.符号      C.色彩       调料

小题5:What is the main idea of the passage?

A．What passwords are.

B．How a password is hacked.

C．How to make your password much safer.

D．Why hackers hack your password.
查看答案
微信公众账号搜索答案