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问题 单项选择题

2002年卫生部颁布的有害物质职业接触限值GBZ2-2002中，将作业场所空气中苯的时间加权容许浓度规定为（）。

A.10mg/m3

B.5mg/m3

C.6mg/m3

D.5mg/m3

E.5mg/m3

答案

参考答案：C

选择题

家庭联产承包责任制和乡镇企业对发挥公有制经济的主体作用具有重大意义，这体现在[ ]

①体现着共同富裕的原则

②广泛吸收社会分散资金

③缓解就业压力

④增加公共财富和国家税收

A．①②③

B．②③④

C．①②④

D．①②③④
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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 (71) from a friend who asks you to open it. This is what happens with Melissa and several other similar email (72) . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’s address book, previous emails, web pages (73) .
As administrators seek to block dangerous email attachments through the recognition of well-known (74) , 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 (75) access to your network.

A．cracker

B．user

C．customer

D．client
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