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问题 选择题

2008年9月25日21时10分，我国自行研制的_____________载人航天飞船在酒泉卫星发射中心发射升空，在随后的飞行中，我国航天员首次进行出舱活动。[ ]

A、神舟五号   

B、神舟六号  

C、神舟七号  

D、嫦娥一号

答案

答案：C

单项选择题

牙髓活力温度测试的中冷刺激是指

A．低于0℃的刺激

B．低于5℃的刺激

C．低于10℃的刺激

D．低于15℃的刺激

E．低于20℃的刺激
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单项选择题

Melissa and LoveLetter made use of the trust that exists between friends or colleagues. Imagine receiving an (46) from a friend who asks you to open it. This is what happens with Melissa and several other similar E-mail (47) . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’s address book, previous emails, web pages (48) .

A. virtualB. virus C. worms D. bacteria

As administrators seek to block dangerous email attachments through the recognition of well-known (49) , 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 (50) access to your network.
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