如图所示的实验可用于研究可燃物燃烧的条件.(1)实验中观察到的现象是______

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问题:

如图所示的实验可用于研究可燃物燃烧的条件.(1)实验中观察到的现象是______,涉及到的化学反应方程式______.

(2)烧杯中热水的作用是______.

(3)本实验运用了对比的实验方法,铜片上的白磷与红磷对比,能得出可燃物燃烧的条件是______,两处白磷对比能得出可燃物燃烧的条件是______.

考点:验证物质燃烧的条件化学反应方程式的书写文字表达式
题型:填空题

关于违反治安管理行为的概念表述正确的是( )。

A.是扰乱公共秩序,妨害公共安全的行为

B.是具有社会危害性的行为

C.是尚不够刑事处罚的行为

D.是应当给予治安管理处罚的行为

题型:填空题

流脑治疗常用的是()

A.抗生素治疗

B.抗病毒治疗

C.针对高热、抽搐、呼吸衰竭等对症治疗

D.抗毒素治疗

E.补液治疗

题型:填空题

商业银行的首要经营原则是:

A.流动性

B.安全性

C.合法性

D.效益性

题型:填空题

阅读理解。

     One day, a young man was cleaning out his late grandfather's belongings when he came across a bright

red envelope. Written on the front were the words, "To my grandson." Recognizing his grandfather's

handwriting, the young man opened the envelope. A letter inside read:

Dear Ronny,

     Years ago you came to me for help. You said, "Grandpa, how is it that you've accomplished so much in

your life? You're still full of energy, and I'm already tired of struggling. How can I get the same enthusiasm

that you've got?"

     I didn't know what to say to you then. But knowing my days are numbered, I figure that I owe you an

answer. So here is what I believe.

     I think a lot of it has to do with how a person looks at things. I call it "keeping your eyes wide open".

     First, realize that life is filled with surprises, but many are good ones. If you don't keep watching for

them, you'll miss half the excitement. Expect to be thrilled once in a while, and you will be.

     When you meet up with challenges, welcome them. They'll leave you wiser, stronger, and more capable

than you were the day before. When you make a mistake, be grateful for the things it taught you. Resolve to

use that lesson to help you reach your goals.

     And always follow the rules. Even the little ones. When you follow the rules, life works. If you think you

ever really get by with breaking the rules, you're only fooling yourself.

     It's also important to decide exactly what you want. Then keep your mind focused on it, and be prepared

to receive it.

     But be ready to end up in some new places too. As you grow with the years, you'll be given bigger shoes

to fill. So be ready for endings as well as challenging beginnings.

     Sometimes we have to be brave enough to move from the familiar to the unfamiliar. Life isn't just reaching

peaks. Part of it is moving from one peak to the next. If you rest too long in between, you might be tempted

to quit. Leave the past in the past. Climb the next mountain and enjoy the view.

     Dump things that weigh you down emotionally and spiritually. When an old resentment, belief, or an

attitude becomes heavy, lighten your load. Shed those hurtful attitudes that slow you down and drain your

energy.

     Remember that your choices will create your successes and your failures. So consider all the pathways

ahead, and decide which one to follow. Then believe in yourself, get up, and get going. 

     And be sure to take breaks once in a while. They'll give you a renewed commitment to your dreams and

a cheerful, healthy perception of the things that matter the most to you.

     Most important of all, never give up yourself. The person that ends up a winner is the one who resolves

to win. Give life everything you've got, and life will give its best back to you.

                                                                                                                                       Love always, 

                                                                                                                                       Grandpa

1. The underlined part "But knowing my days are numbered" implies that ____.

A. his grandpa could count days

B. his grandpa's each day was important

C. his grandpa knew he was dying

D. his grandpa was eager to tell the young man

2. Why did the young man's grandpa write this letter?

A. Because he wanted to recall his whole life.

B. Because he wanted to tell his grandson how great he was.

C. Because he wanted to explain how to keep energy.

D. Because he wanted to show how to succeed.

3. The young man's grandpa may agree ____.

A. how a person looks at things has nothing to do with one's future

B. we should be thankful for what mistakes teach us

C. successful life is just reaching peaks

D. it's not so important to decide exactly what you want

4. According to the passage, ____.

A. learning to give up is very important

B. we'd better stay in the familiar

C. obeying little rules doesn't matter

D. taking breaks once in a while is good for us

题型:填空题

一种小型的、经营时间较长的、位于居民区附近、出售家庭日用商品的零售商是()。

A.便利店

B.百货公司

C.专卖店

D.折扣商店

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