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问题 多项选择题

根据《GB50374-2006通信管道工程施工及验收规范》的规定，为保持钢筋与模板的间距相等，可在钢筋下垫以自制的（）或（）等。

A.木块

B.塑料块

C.混凝土块

D.砂浆块

答案

参考答案：C, D

选择题

下列措施中，能提高生态系统的自我调节能力的是 [ ]

A．减少生物的种类   

B．减少生产者的数量   

C．增加生物的种类   

D．增加消费者的数量

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单项选择题

Melissa and LoveLetter made use of the trust that exists between friends orcolleagues．Imagine receiving an (71) from a friend who asks you to open it．This is whathappens with Melissa and several other similar email (72) ．Upon running，such wormsusually proceed to send themselves out to email addresses from the victim’s address book，previous emails，web pages (73) ．

A．memory B．caches C．ports D．registers

As administrators seek to block dangerous email attachments through the recognition ofwell—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 wilt still runand 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，simultaneouslyruns commands in the background to steal your passwords and give the (75) access to yournetwork．
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