问题 单项选择题

下列是对液上喷射型低倍数泡沫产生器原理的叙述,其说法不正确的是()。

A、当泡沫混合液通过产生器喷嘴时,形成了扩散雾化射流

B、在喷嘴内产生负压

C、在喷嘴周围产生负压

D、从而吸入大量空气形成空气泡沫

答案

参考答案:B

阅读理解

阅读理解。

      "Teenager" means people from 13 to 19 years old. Although they're young, they have to make many

important choices by themselves. They need to think about questions like these: Should we go to college?

What kind of jobs do I want? However, other people also influence their choices. Who influences teenagers?

      It depends on the kind of choice. When teenagers buy things,friends are the most important influence.

This is especially true for clothes and music. TV shows, advertisements and parents also influence teenagers.

In more serious things, parents are probably the most important influence. Some teenagers say it's best to

regard both parents and friends as influences. James, a seventeen-year-old boy says he's "just a crazy man",

he also says, "Parents are really important because they can tell you what's right and wrong. " But teenagers

also feel they need to make choices-to make their own mistakes. As one teenager girl said, "If our parents

don't let us make our own choices, maybe in the future we don't know how to do it. " And they feel friends

can often be a big help, especially because friends sometimes know more about their situation than their  

parents do.

      Do you depend on parents or others when you decide what to do and how to do it? Whoever you depend

on, the correct choice is the most important. Your future is in your hand.

根据短文内容,判断句子正(T)误(F)。

( )1. People from 13 to 19 can be called teenagers.

( )2. When teenagers buy clothes and music, friends are the most important influence.

( )3. TV shows and advertisements can't influence teenagers.

( )4. In more serious things, friends are probably the most important influence.

( )5. Sometimes friends know more about teenagers' situation than their parents.

单项选择题