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问题 填空题

按照三角形角的不同，可以把三角形分成______、______、______．

答案

三个角都是锐角的三角形叫锐角三角形，

有一个角是直角的三角形叫直角三角形，

有一个角是钝角的三角形叫钝角三角形．

故答案为：锐角三角形；直角三角形；钝角三角形．

单项选择题

Melissa and LoveLetter made use of the trust that exists between friends or colleagues. Imagine receiving an (16) from a friend who asks you to open it. This is what happens with Melissa and several other similar email (17) . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’s address book, previous emails, web pages (18) .
As administrators seek to block dangerous email attachments through the recognition of well-known (19) , virus writers use other extensions to circumvent such protection. Executable (.exe) files are renamed to .bat and .cmd plus a whole list of other extensions and will still run and successfully infect target users.
Frequently, hackers try to penetrate networks by sending an attachment that looks like a flash movie, which, while displaying some cute animation, simultaneously runs commands in the background to steal your passwords and give the (20) access to your network.

A．virtual

B．virus

C．worms

D．bacteria
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判断题

石化生产中存在诸多不安全因素。事故多，损失大。
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