与牙周炎密切相关的细胞因子不包括（） A.白细胞介素 B.肿瘤坏死因子-α

视网膜前出血是指（）

A.出血位于视网膜内核层

B.出血位于内界膜下

C.出血位于玻璃体皮层与内界膜之间

D.出血位于玻璃体后部

E.出血位于神经纤维层

下列关于PGP（Pretty Good Privacy）的说法中不正确的是 （35） 。

A．PGP 可用于电子邮件，也可以用于文件存储

B．PGP 可选用MD5 和SHA 两种Hash 算法

C．PGP 采用了ZIP 数据压缩算法

D．PGP 不可使用IDEA 加密算法

Melissa and LoveLetter made use of the trust that exists between friends or colleagues.Imagine receiving an （） from a friend who asks you to open it. This is what happens with Melissa and several other similar email （） . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’s address book, previous emails, web pages （） . As administrators seek to block dangerous email attachments through the recognition of well-known （） , 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 （） access to your network.

Imagine receiving an （） from a friend who asks you to open it.

A．attachment

B．packet

C．datagram

D．message

润滑油应具有（）四方面优良的性能。

A、流动性能、安定性能、纯洁性能和润滑性能

B、流动性能、安全性能、纯洁性能和极压性能

C、流动性能、安定性能、纯洁性能和极压性能

D、润滑性能、极压性能、纯洁性能和安全性能

对调查结果的综合性评论是经过详细深入的调查活动，对企业的基本状况有一个充分的感性认识，客观理性地对其作出恰当的（），是构筑新的概念系统的基础。

A.评估

B.评价

C.统筹

D.规划