具有抗肿痛作用的药物是（） A．丹参  B．川芎  C．莪术  D．延胡索乙素  E

下列不属于访谈法的优点的是( )

A．应答率高

B．资料丰富、完整

C．适合文化程度较低而无法书写的研究对象

D．影响因素少

甲企业与乙企业采取以物易物方式销售商品，甲企业货物价值20万元，乙企业货物价值25万元，双方签订了购销合同，甲企业支付补价5万元。此项业务应纳印花税( )元。

A．150

B．135

C．270

D．300

模块分解的最终目的是什么？

You have probably seen ads (广告) in newspaper or on television for mail-order companies. Perhaps a catalogue (商品目录) has been sent to you. Why do people buy things they have not seen in person Some people believe that things can be bought more cheaply by mail. Another good thing about buying by mail is that it is easier and more enjoyable to sit at home and work through a catalogue than to shop around the stores. With a catalogue from a large company, you have your own shop window for almost everything you want to buy.
Buying from a catalogue is so easy. It saves the shopper’s time and trouble. Sometimes, it saves the shopper’s money, too. But people often buy more than they can really afford(付得起) or need, because many things look so good to them. They can probably pay a certain part of the full price—a down payment. Then they pay a certain amount of money every month until the goods is paid for in full. But by then they often find what they have bought are of no use at all.

What is the problem with mail-order
[A] People have to work through a catalogue．
[B] People may buy more than they are able to pay for．
[C] People have to pay every month．

生产函数Q＝f（L，K）的要素组合与产量的对应图，如图所示，这张图是以坐标平面的形式编制的。其中，横轴和纵轴分别表示劳动投入量和资本投入量，虚线交点上的数字表示与该点的要素投入组合对应的产量。

（1）图中是否存在规模报酬递增、不变和递减？

（2）图中是否存在边际报酬递减？

（3）图中哪些要素组合处于同一条等产量曲线上？