对煤燃烧后的烟气进行脱硫处理的主要反应原理为:2SO2+2CaCO3+4H2O+

题型:计算题

问题:

对煤燃烧后的烟气进行脱硫处理的主要反应原理为:2SO2+2CaCO3+4H2O+O2==2CO2+2CaSO4·2H2O(石膏)。某处理厂现有125t含杂质的石灰石,若运用上述原理吸收SO2气体,测量数据如下表:

试计算:

(1)表中m为____,

(2)完全反应后被吸收的SO2质量为____,

(3)计算该石灰石中碳酸钙的质量分数。

考点:化学反应方程式的计算
题型:计算题

(共5小题,每小题2.5分,满分12.5分)

根据对话内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Taking good notes is a time-saving skill that will help you to become a better student in several ways.      1    .Second, your notes are excellent materials to refer to when you are studying for a test. Third, note-taking offers variety to your study time and helps you to hold your interest.

You will want to take notes during classroom discussions and while reading a textbook or doing research for a report. ____2_____. Whenever or however you take notes, keep in mind that note-taking is a selective process._____3______.

The following methods may work best for you.                                

●Read the text quickly to find the main facts and ideas in it.

●Carefully read the text and watch for words that can show main points and supporting facts.

●Write your notes in your own words.

●_____4_____.

●Note any questions or ideas you may have about what was said or written.

As you take notes, you may want to use your own shorthand(速记). When you do, be sure that you understand your symbols and that you use them all the time._____5_____.

A.Use words , not complete sentences.

B.There are three practical note-taking methods.

C.You must write your notes on separate paper.

D.Otherwise, you may not be able to read your notes later.E. You will also want to develop your own method for taking notes.

F. That means you must first decide what is important enough to include in your notes.

G. First, the simple act of writing something down makes it easier for you to understand and remember it.

题型:计算题

电气设备正常工作时,产生热量是()。

A、不正常

B、正常

C、错误

D、不可能

题型:计算题

甲、乙两同学因感冒发烧而进行输液治疗,护士从甲同学左手背静脉输入药物,从乙同学右脚背手背静脉输入药物,则输入的药物分别最先流入甲、乙同学心脏的哪个腔(  )

A.甲心脏的左心房、乙心脏的左心房

B.甲心脏的右心房、乙心脏的右心房

C.甲心脏的左心房、乙心脏的右心房

D.甲心脏的右心房、乙心脏的左心房

题型:计算题

下列关于汽缸螺栓热应力叙述错误的是()。

A、启动时,法兰膨胀使螺栓受到热拉应力

B、螺栓被坚固时受到一个预拉应力

C、缸内蒸汽对螺栓产生一个拉应力

D、停机时,法兰收缩,螺栓受到热压应力。

题型:计算题

女性,30岁,有精神病史,误服氯丙嗪100片后,出现神志恍惚,BP:90/50mmHg,HR:120次/分。下列哪一项不是急性氯丙嗪中毒的临床表现()。

A.震颤麻痹

B.静坐不能

C.急性肌张力障碍

D.直立性低血压

E.以上都不是

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