题干

A.活性炭B.二氧化碳C.干冰D.二氧化硫E.氮气F.一氧化碳,选择正确答案的化学式填空:

①形成酸雨的主要物质是____.

②可用于人工降雨和舞台制造“云雾”效果的物质是____;

③具有吸附性,净水器中常使用的物质是____.

④香烟燃烧产生的能与血液中血红蛋白结合的有毒气体是____

⑤能使澄清石灰水变浑浊的是____.

上一题 下一题 0.0难度 选择题 更新时间:2019-06-24 02:38:34

答案(点此获取答案解析)

SO2,CO2,C,CO,CO2

同类题4

任务型阅读

                                                                           Ways to Free Your Mind You're Feeling Stuck

    Have you ever like you were racing around in without making much forward progress? If you're stuck and you don't know how to rise, don't look outside yourself. Look below.____

    Go back to what's important

    When we get stuck, it can be extremely useful to come back to these three things: core values, beliefs and goals. Why?____

    Ask for help

    Very often, highly happy and successful people have a supporting group of friends, family and others who help them____And don't be afraid to reach out and help someone who's even more stuck than you.

    Embrace the natural pathways

    When you get stuck, there's no need to go back to the drawing board. Ask the people around you about the systems that are working for them, read insightful books and blog articles, and use the same methods and pathways that others have used to get unstuck.____

    Relocate yourself to an inspiring environment

    ____You can go for a walk in a nearby park. You can come out of the office for a cup of coffee. Or if you are at home, you can simply go to a different room in the house. Whether it's urban spaces, parks, libraries, museums or even our own backyards, there are plenty of available sources that we can draw inspiration and strength from.

A. Goals are the outcomes in life that we strive for.

B. Here are some useful ways to help yourself get unstuck.

C. When you are stuck, don't be afraid to ask for help.

D. One way to get unstuck is to simply change your environment.

E. Because they form the basics of what is important to us as individuals.

F. Break the circle of worry and work on something else.

G. In fact, the system is nothing more than a natural pathway of thought that someone has created with their mind.