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问题 单项选择题

各调速部件的密封结合面应根据图纸要求决定是否加垫，如需加垫片或密封垫料时，应根据（）予以更换。

A.原拆卸的垫片厚度

B.图纸要求的垫片厚度

C.具体情况使用原拆卸的垫片厚度或图纸要求的垫片厚度

D.组装时装配的需要确定

答案

参考答案：C

判断题

分析事故的安全性，最简单的方法是分析和考察其静态状态和动态表现。
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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 (66) from a friend who asks you to open it. This is what happens with Melissa and several other similar email (67) . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’ s address book ,previous emails, web pages (68) .
As administrators seek to block dangerous email attachments through the recognition of well- known (69) , virus writers use other extensions to circumvent such protection. Executable (.exe) files are renamed to . bat and . cnd 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 (70) access to your network.

A．virtual

B．virus

C．worms

D．bacteria
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