单项选择题

端口转发的作用是什么？
A、端口转发允许外部用户获得位于 LAN 内部的私有 IPv4 地址的服务。
B、端口转发允许用户到达 Internet 上不使用标准端口号的服务器。
C、端口转发允许内部用户获得位于 LAN 外部的公有 IPv4 地址的服务。
D、端口转发允许将内部本地 IP 地址转换为外部本地地址

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单项选择题

以下三种油液的清洁度等级分别为如下三项，其中（）表示的清洁度等级最高。

单项选择题

5. How the case reading article describes iPad software features from the view of Application?
A、Although the iPad is not designed to replace a mobile phone, a user can use a wired headset or the build-in speaker and microphone and place telephone calls over Wi-Fi or 3G using a VoIP application.
B、The layout of the music library is similar to that of an iPod or current Symbian S60 phones.
C、 On iTunes, the feature shows the different album covers in a scroll-through photo library.
D、The interface is centered around the home screen, a graphical list of available applications.