世界时_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题名词解释

世界时

答案

参考答案：1884年国际上决定，全世界的地理经度是从英国的格林尼治天文台的子午线（称本初子午线）起算的。格林尼治地方时常用特定符号来表示：S表示格林尼治地方恒星时，M表示格林尼治地方平时。。格林尼治地方平时又称为世界时，每天从子夜算起，由0时计算到24时。世界时与地方平时之间的关系为：地方平时=世界时±经度（东经用+，西经用-）

阅读理解

Dear editor,
My English teacher is very strict (严厉)with us. Several days ago, when we were having class, Tom asked me a question. But she thought we were speaking in class. She asked us to stand at the back of the classroom for a few minutes. This made me uncomfortable. After that, I feel nervous in her class, so I don’t like her class. However, I really want to learn English well. What should I do?
Yours,
Mike

Dear Mike,
I am sorry you are having difficulty with your English class. Every teacher wants his or her students to study hard especially in class. So I think you should have a talk with your English teacher and tell her what you were doing with Tom that day. If she knows your worries, maybe she will help you with your English. And she will be pleased to hear you want to learn English well. I believe when students are not trying as hard as they can, a teacher is forced（被迫）to take actions.
Yours,
Editor

小题1:What’s wrong with Mike?

A．He meets trouble with his parents.

B．He doesn’t know how to get on well with his classmates.

C．He has a hard time with his English class.

D．He is always speaking in class.

小题2:What happened in that English class?

A．Mike couldn’t answer the question. So the teacher asked him to stand.

B．Mike had an argument with Tom about the question.

C．Tom asked Mike a question, and the teacher thought they were speaking.

D．Mike felt uncomfortable because he was ill.

小题3:In the editor’s opinion, why did the English teacher punish(惩罚) Mike?

A．Because the English teacher didn’t think Mike was studying hard in class.

B．Because Mike answered the question wrong.

C．Because Mike was bad at English.

D．Because Mike had a fight with other students.

小题4:What does the underlined phrase“ take actions” mean in Chinese?

A．采取行动

B．参加活动

小题5:What can we learn from the letters?

A．Mike wants to have a talk with his English teacher.

B．Mike wants the editor to say something to his English teacher.

C．The editor gave Mike some advice, but it didn’t work.

D．Mike dislikes English classes now, but he wants to learn English well.

填空题

（1）①常温下，pH=3的盐酸和pH=11的氢氧化钡等体积混合，溶液的pH= 。

②常温下pH=3的盐酸和pH=6的盐酸等体积混合，溶液的pH= 。（lg2=0.3）

（2）在某温度下，H₂O的离子积常数为1×10^－13，则该温度下

①某溶液中的H⁺浓度为1×10^－7mol/L，则该溶液呈性。

②0.01mol/LNaOH溶液的pH= 。

③99mL pH=1的H₂SO₄溶液与101mL pH=12的KOH溶液混合后，溶液的pH= 。