多媒体技术中的唇同步是指 【2】 与音频流的同步。

Have you ever noticed advertisements which say “Learn a foreign language in 6 weeks, or your money back! From the first day your pronunciation will be excellent. Just send…” and so on? Of course, it never happens quite like that. The only language that is easy to learn is one’s mother tongue. And think how much practice that gets! Before the Second World War people usually learnt a foreign language in order to read the literature of the country.

Now speaking a foreign language is what most people want. Every year millions of people start learning one. How do they do it? Some people try at home, with books and records of tapes; some use radio or television programs; some use computers and network; others go to evening classes. If they use the language only 2 or 3 times a week, learning it will take a long time, like learning a foreign language at school. A few people try to learn a language fast by studying for 6 or more hours a day. It is clearly easier to learn the language in the country where it is spoken.

However, most people cannot afford this, and for many it is not necessary. They need the language in order to do their work better. For example, scientists and doctors chiefly need to be able to read books and reports in the foreign language. Whether the language is learnt quickly or slowly, it is hard work. Machines and good books will help, but they cannot do the student’s work for him.

小题1:According to some advertisements, you ______ .

A．have to pay your money if you cannot master a foreign language in 6 weeks.

B．needn’t pay you money if you cannot learn a foreign language in 6 weeks

C．must pay your money if you cannot master a foreign language in 6 weeks

D．will be paid much money if you cannot learn a foreign language in 6 weeks小题2:Now most people try to learn a foreign language in order to ______.

A．read the literature of the country

B．read books and reports

C．do their work better

D．go to foreign countries小题3:Learning a foreign language is a hard job ______.

A．only for scientists and doctors

B．only for the students at school

C．for those people at home

D．for most people

用户投诉率的指标百万门以下局应小于（）。

A、0.2%

B、0.3%

C、0.4%

D、0.5%

行纪合同与委托合同的主要区别有( )。

A．行纪人以自己的名义与第三人订立合同；而委托合同的受托人原则上是以委托人的名义订立合同

B．行纪合同为有偿合同；而委托合同可以是有偿的，也可以是无偿的

C．行纪人处理委托事务支出的费用，，除当事人另有约定，应自行承担；而委托合同的受托人的费用由委托人承担

D．行纪合同，因行纪人的过错给委托人造成损失的，委托人可以要求赔偿损失；而委托合同，因受托人的故意或者重大过失给委托人造成损失的，委托人才可以要求赔偿损失

对UMG8900设备背板提供的信号互连通路描述错误的是（）。

A、控制信号通道：由主备OMU/MPU板连接至系统内的其它单板的100M快速以太网（FE.通道和MBUS差分串行总线

B、高速TDM数据通道：由TNU/TCLU板连接至其它TDM业务单板的777M高速差分LVDS信号通道

C、高速分组数据通道：由NET板连接至各分组业务单板的1.25G/2.5G高速差分LVDS信号通道

D、级联信号通道：由前插级联板BLU、后插级联板FLU连接至IP网板、TDM网板的LVDS高速差分信号通道和LVTTL状态识别信号通道

某抽油机井，实测示功图为正常，产液量为0，分析判断为井口油管挂严重漏失，电流的变化是（）。

A、上行电流不变，下行电流不变

B、上行电流上升，下行电流下降

C、上行电流上升，下行电流上升

D、上行电流下降，下行电流下降