搜题请搜索小程序“爱下问搜题”
问题 填空题

a是一个三位数，b是一个两位数，若把b放在a的左边，组成一个五位数，则这个五位数为（   ）

A．b+a

B．10b+a

C．100b+a

D．1000b+a

答案

答案：D

三位数a放在一个两位数b右面相当于b扩大了1000倍，那么这个四位数为（1000b+a）．故选D

解答题
求X的值
X÷3=4		410+X=7400.8X=0.56
X÷8=160X+0.54=7.255X=10.5
查看答案
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．memory

B．caehes

C．ports

D．registers
查看答案