价值与生产价格的关系是（） A.价值是生产价格的基础 B.生产价格是价值的转化形式

A Policeman and a Thief  

One day a policeman was taking a thief to the city . On the way , they saw a shop . The thief said . “ Let me go into the shop to buy some bread . We can eat it in the train . ”

The policeman agreed . The thief went into the shop and ran out of the back door . When the policeman knew that , he began to look for the thief everywhere . At last the policeman caught(抓获) thief again . They went on to the city . On the way they came to the same shop . The thief wanted to buy some bread again . “Oh , no . ” said the policeman , “You did that before , and you ran away . This time I^’ll go into the shop and buy bread . You must wait here for me . ”

小题1:What was the policeman doing one day ?

A．Catching a thief with others .

B．Doing nothing.

C．Taking a thief to the city .

D．Walking go the city by himself .小题2:On the way the thief asked to         .

A．buy some food to eat .

B．let him free .

C．take a rest .

D．walk slowly .小题3:When the thief went into the shop , he ran out of        .

A．the back door .

B．the back window .

C．the front door .

D．the front window .小题4:When the thief ran away the first time , what did the policeman do ?

A．The policeman caught the thief again .

B．The policeman looked for the thief . but he didn^,t find him .

C．The thief was caught again by other policemen .

D．The policeman went back without(没有) the thief .小题5: From the last three sentences, we know that the policeman was very        .     

A．brave

B．careful

C．clever

D．foolish

假定有4个寡头厂商，生产中没有可变成本，面对的市场需求曲线是P=120-Q，如果每个厂商都要按古诺模型使得利润极大，则（）。

A．每个厂商生产单位产品

B．市场价格p＝24

C．行业供给量是90单位产品

D．不存在稳定均衡

营业厅开放省内异地办理积分换话费服务。（）

局域网争用信道方案的一个缺点是，由于多个站点试图同时访问信道而造成的信道带宽浪费。假设将访问时间分割成离散的时隙，每个时隙中有n个站点以概率p试图发送数据帧。由于多个站点试图同时发送数据而被浪费的时隙比例是（）。

A．1-np(1-p)ⁿ

B．1-(np+1)(1-p)ⁿ

C．1-pⁿ(1-p)ⁿ-n(1-p)^n-1

D．1-np(1-p)^n-1

天然气热值、汽油热值、电热功是如何换算的？