问题 填空题

线切割的加工工艺主要是()和机械参数的合理选择。电加工参数包括峰值电流、脉冲宽度、脉冲间隔等。机械参数包括走丝速度和进给速度等。

答案

参考答案:电加工参数

阅读理解

In most languages, a greeting is usually followed by "small talk". Small talk means the little things we talk about at the start of a conversation. In English-speaking countries people often make small talk about the weather: "Nice day, isn't it?" "Terrible weather, isn't it?" But there is something special about small talk. It must be about something which both people have the same opinion about. The purpose of small. talk is to let both people agree on something. This makes meeting people easier and more comfortable. People usually agree about the weather, so it is a safe topic for small talk. But people often disagree about religion or politics so these are not suitable topics for small talk in English. The topics for small talk also depend on where the conversation is taking place. At football matches, people make small talk about the game they are watching: "Great game, isn't it?" At bus-stops, people may comment about the transport system: "The bus service is terrible, isn't it?"

Greetings and small talk are an important part of conversation in any language. The way people greet each other and the things they talk about, however, may be different from one language to another. This shows that there is much more to learn when we learn a language than just the vocabulary and the grammar of the language. We also have to learn the social behavior of the people who speak it.

小题1:The passage suggests that when we learn a language______.

A.we should know the culture about the country

B.we should only master the grammar and vocabulary

C.we should grasp the importance of the language

D.we should learn about the transport system of the country小题2: When we say "Great game, isn't it?" we in fact______.

A.have a conversation

B.begin a small talk

C.greet each other

D.ask a question小题3: What we learn from the passage is that______.

A.in English-speaking countries we should talk about the weather

B.different language has different grammar

C.small talk is an important part in a language

D.small talk depends on the purpose of the conversation

单项选择题