搜题请搜索小程序“爱下问搜题”
问题 单项选择题

以下哪一种分析方法不能控制病例对照研究中的混杂因素（）

A.按暴露水平分级分析

B.logistic多元回归分析

C.按混杂因素分层分析

D.配比分析

E.叉生分析

答案

参考答案：A

单项选择题

Melissa and LoveLetter made use of the trust that exists between friends or colleagues. Imagine receiving an (6) from a friend who asks you to open it. This is what happens with Melissa and several other similar email (7) . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’s address book, previous emails, web pages (8) .

As administrators seek to block dangerous email attachments through the recognition of well-known (9) , 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 (10) access to your network.

7（）

A.virtual

B.virus

C.worms

D.bacteria
查看答案
名词解释

浮游植物
查看答案