当加热炉炉管破裂时应采取（）措施。A.加热炉紧急停炉 B.开大烟道挡板 C.开大风道

阅读下文，从各小题所给的四个选项中选出能回答所提问题或完成所给句子的最佳答案。

     There have been many great inventions or things that changed the way we live. The first great invention

  was the one that is still very important today-the wheel. This made it easier to carry heavy things and to

 travel long distance.

     For hundreds of years after that there were few inventions that as much effect as the wheel. Then in the

  early 1800s the world started to change. There was little unknown land left in the world. People didn't

 have to explore much any more. They began to work instead to make life better.

     In the second half of the 19th century many great inventions were made. Among them there were the

 camera, the light and the radio. These all play a big part in our daily life today.

    The first part of the 20th century saw more great inventions. The helicopter in 1909, movies with sound

  in 1926, the computer in i928,jet planes in 1930. This was also a time when a new material was first

 made. Nylon came out in 1935. It changed the kind of clothes people wore.

     The middle part of the 20th century brought new ways to help people get over diseases. They worked

  very well.  They made people healthier and allowed them to live longer. By the 1960s most people could

  expect to live to be at least 60.

     By this time most people in developed countries had a very good Life. Of course new inventions

  continued to be made. But man now had a desire (渴望) to explore again. The earth was known to man

  but the stars were not. Man began looking for ways to go into space. Russia made the first step. Then

  United States took a step. Since then other countries, including China and Japan, have made their own

 steps into space.

      In 1969 man took his biggest step away from earth. Americans first walked on the moon. This is

 certainly just a beginning, though. New inventions will some day allow us to do things we have never yet

  dreamed of.

1. This passage talks mainly about ______.

    A. why cars were very important

    B. when light was invented

    C. how inventions affect people's daily life

    D. which country made the first step into space

2. According to the passage man didn't have a desire to explore a lot ______.

    A.  at the beginning of 1800s  

    B.  in the 1960s

    C. since the 1900s            

    D. from the 1800s to 1960s

3.  In the 1800s, people began to work in order to make ______.

    A. explorations             

    B. their life better

    C. discoveries              

    D. a trip to space

4.  Nylon came out five years later than ______.

    A. radio                  

    B. camera

    C. jet planes                

    D. movies

5.  People can live longer lives because ______ that help cure diseases have worked very well.

    A. doctors                  

    B. new ways

    C. medicines                

    D. new hospitals

下列措施对增大反应速率明显有效的是[ ]

A．Na与水反应时增大水的用量

B．Fe与稀硫酸反应制取氢气时，改用浓硫酸

C．在K₂SO₄与BaCl₂两溶液反应时，增大压强

D．将铝片改为铝粉，做铝与氧气反应的实验

产后6个月，哺乳，已恢复月经2个月，对橡胶过敏，宜选择的避孕方法是（）

A.宫内节育器

B.阴茎套

C.短效口服避孕药

D.长效口服避孕药

E.输卵管、输精管结扎术

根据使用的动力分类，植保机械可以分为（）类型。

A、1种

B、2种

C、3种

D、4种

【BSC】某局有一个小区单载频配置，有一天手机用户投诉说基站附近该小区信号不好，话音质量差。工程师拿着测试手机到基站测试，发现手机能上网，但是即使锁定该小区频点拨打电话，也立即被指配到附近其它基站的载频上，且话音质量不好。

通过一些操作，得到以下信息：

1）该基站没有任何告警。

2）查看话统，发现该小区TCH根本就没有话务量，切换接入也没有；SDCCH有占用请求，但是全部失败。

3）跟踪Abis口信令，立即指配命令所指配显示载频频点号为7A，也就是122，对该小区强制发送系统消息，在SYSTEMIMFO1中表明载频频点也是7A即122。

4）打开基站远端维护台，获取小区属性表明频点却是118；发现基站工作频点有疑问，查询BSC数管台，检查该小区有关频点信息的表格《小区分配表》、《载频配置表》，数据配置一致，没有错误，频点为118。

5）对《小区分配表》、《载频配置表》两个表查看主机，发现主机中频点为122。

6）询问现场工程师，说该站以前在网优中曾经修改过频点，原来工作频点为122，后来改为118，采用动态设定设定到主机，成功更改后正常运行了一段时间，在出现用户投诉前，该基站所在模块又成功做过两次MPU主备倒换操作。

根据这些信息，定位出了问题所在，在实验室模拟，该问题得到重现，请回答以下问题：

如何避免这种情况发生？