国际通用的符号体系，是一种长度固定、无含义的条码，所表达的信

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问题单项选择题

国际通用的符号体系，是一种长度固定、无含义的条码，所表达的信息全部为数字，主要应用于商品标识的码制是( )。

A．39码

B．25码

C．93码

D．EAN 码

答案

参考答案：D

填空题

单词拼写。

1. You should pay attention to your behavior. After all, first ______(印象)are half the battle.

2. It's just a ______(常规的)medical examination, nothing to get worried about.

3. The ______(推荐) dosage (剂量) is one tablet every four hours.

4. If plastic and rubber are burnt, they'll give off ______(毒) gases.

5. These magnificent ancient buildings show the great ______(智慧)of the labouring people.

6. We do not like to b______ with you about the prices.

7. Please reply at your earliest c________.

8. I know him, but we don't f______ see each other.

9. C______ cars are more streamlined(流线型的) than older ones.

10. I taught in the Workers' Educational A______ in the thirties.

选择题

供求关系的变化直接影响商品的（）

A．价格，使价格围绕价值上下波动

B．价值，使价格围绕价值波动

C．生产，使生产扩大或缩小

D．交换，使商品不能等价交换