火焰检测系统属于()A.自动检测系统 B.自动控制系统 C.自动信号连锁保护系统 D

题型:单项选择题

问题:

火焰检测系统属于()

A.自动检测系统

B.自动控制系统

C.自动信号连锁保护系统

D.自动排污系统

考点:采气工考试采气高级工考试采气高级工考试题库
题型:单项选择题
函数y=
2x-2
x
的定义域为______.
题型:单项选择题

I have forgotten the name of an old lady who was a customer on my paper route when I was a twelve-year-old boy back in 1954. Yet it seems like just yesterday that she taught me a lesson in forgiveness that I can only hope to pass on to someone else someday.

On a Saturday afternoon, a friend and I were throwing rocks onto the roof of the old lady's house. I found a smooth rock and sent it. The stone headed straight for a small window on the old lady's back door. At the sound of broken glass, we took off from the old lady's yard.

I was too scared about getting caught that first night. However, a few days later when I was sure that I hadn't been discovered, I started to feel guilty for her misfortune.

I decided to save my paper delivery money, and in three weeks I had the seven dollars that I thought would cover the cost of her window. I put the money in an envelope with a note explaining that I was sorry for breaking her window. Then I put the envelope through the letter slot in her door. My soul felt redeemed (救赎) and I couldn't wait for the freedom of, once again, looking straight into the old lady's eyes.

The next day, I. handed the old lady her paper. She thanked me for the paper and said, "Here, I have something for you. " It was a bag of cookies. I thanked her and ate the cookies as I continued my route.

After several cookies, I felt an envelope and pulled it out of the bag. When I opened the envelope, I was shocked. Inside was the seven dollars and a short note that said, “I'm proud of you. ”

小题1:What work did the author do at the age of 12?

A.Repairing roofs.

B.Collecting old papers.

C.Picking rocks.

D.Delivering newspapers.小题2:Why did the author and his friend escape from the old lady's yard?

A.They broke the old lady's back door.

B.They broke the old lady's window.

C.They heard the old lady shouting.

D.They were seen by the old lady.小题3:What did the author do to make up for his mistake?

A.He gave the old lady papers for free.

B.He saved some money to cover the cost.

C.He apologized in the old lady's presence.

D.He bought cookies for the old lady.小题4:According to the passage, the old lady was a person who was        .

A.strict

B.patient

C.generous

D.helpful小题5:What would be the best title for the passage?

A.Seven dollars

B.Being honest

C.A silly mistake

D.True forgiveness

题型:单项选择题

钡和钠相似,也能形成O22离子的过氧化物,则下列叙述错误的是  (   )

A.1mol过氧化钠或过氧化钡跟足量水反应都生成0.5mol氧气

B.过氧化钡的化学式是Ba2O2

C.过氧化钡是离子化合物

D.过氧化钠和过氧化钡都是强氧化剂

题型:单项选择题

将红热的固体单质甲放入显黄色的溶液乙中,剧烈反应产生混合气体A,A在常温下不与空气反应。

(1)试推断:甲为__________、乙为__________、丙为__________、A为__________、B为____________、C为____________。

(2)写出甲与乙反应的化学方程式:____________________________________。

题型:单项选择题

透射电镜对样品有什么要求?

更多题库