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问题 选择题

公式R=

U
I
的物理意义是（　　）

A．加在导体的两端电压越大，电阻越小

B．导体中电流越大，电阻越小

C．导体的电阻等于导体两端电压与通过它的电流的比值

D．以上说法都可以

答案

阻值是导体本身所具有的性质，与通过它的电流、它两端的电压无关，故A、B错误．

电阻可以由公式R=

U
I
求出，故C正确．

所以D错误．

故选C

单项选择题

Information is no good to you if you can’t （） it．The loction dimension of information means having access to information no matter where you are．Ideally, in other words，your location or the information’s location should not matter．You should be able toaccess information in a hotel room，at home，in the student center of your campus，at work，onthe spur of the moment while walking down the street，or even while traveling on an airplane．This location dimension is closely related to （）and wireless computing (and also ubiquitous computing)．

To keep certain information private and secure while providing remote access for employees，many businesses are creating intranets．An intranet is an （） organizational internet that is guarded against outside access by a special （） feature called a firewall (which can be software，hardware，or a combination of the two)．So，if your organization has an intranet and you want to access information on it while away from the office，all you need is Web access and the password that will allow you （） the firewall．

 

This location dimension is closely related to （）and wireless computing (and also ubiquitous computing)．

A．data

B．program

C．mobile

D．information
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单项选择题

有限责任公司的注册资本的最低限额为人民币( )。

A．4万元
B．3万元
C．3.5万元
D．4.5万元
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