2004年7月1日，某无线电厂与某电子元件设备公司(以下简称电子公司)订立的委托加

一个不带电的平行板电容器,用电压为60V的直流电源充电,充电过程中电源耗去了4.8×10^-6J的能量,试求这个电容器的电容,并求在此充电过程中,从一个极板转移过程至另一个极板的电子的数目.

液压直轨器使用的是（）机油。

A.0号

B.10号

C.20号

D.10～20号

Pharming is a scamming practice in which malicious code is installed on a personal computer or server, misdirecting users to (1) fraudulent Web sites without their knowledge or consent. Pharming has been called "phishing without a lure".

In phishing, the perpetrator sends out legitimate- (2) looking e-malls, appearing to come from some of the Web’s most popular sites, in an effort to obtain personal and financial information from individual recipients. But in pharming, larger numbers of computer users can be (3) victimized because it is not necessary to target individuals one by one and no conscious action is required on the part of the victim. In one form of pharming attack, code sent in an e-mail modifies local host files on a personal computer. The host files convert URLs into the number strings that the computer uses to access Web sites. A computer with a compromised host file will go to the fake Web site even if a user types in the correct Internet address or clicks on an affected (4) bookmark entry. Some spyware removal programs can correct the corruption, but it frequently recurs unless the user changes browsing. (5) habits,

2（）

A．connecting

B．binding

C．looking

D．contenttagging

下列关于神经系统组成的叙述中正确的说法是（　　）

A．神经系统分为中枢神经系统和周围神经系统

B．中枢神经系统包括大脑、小脑和脑干三部分

C．周围神经系统包括脊髓和脊神经

D．脑神经和脊神经共同组成了神经中枢