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问题 多项选择题

某分部工程中各项工作间逻辑关系见下表，相应的双代号网络计划如下图所示，图中错误的是（）。

A.多个终点节点 

B.多个起点节点 

C.工作代号重复 

D.不符合给定的逻辑关系 

E.节点编号有误

答案

参考答案：B, D, E

填空题

（1）写出下图字母代表的地理事物名称：

A______省      B______岛屿  C______城市

（2）图中有我国年降水量最多的地方，它是______

（3）台湾岛上的城市主要分布在______（东、西）沿海地区．
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单项选择题

Melissa and Love Letter made use of the trust that exists between friends or colleagues. Imagine receiving an (26) from a friend who asks you to open it. This is what happens with Melissa and several other similar email (27) . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’s address book, previous emails, web pages (28) .

A. virtualB. virus C. worms D. bacteria

As administrators seek to block dangerous email attachments through the recognition of well-known (29) , 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 (30) access to your network.
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