下列各组气体，通常条件下能稳定存在的是( )。

【单选题】【消耗次数：1】

① <img class="kfformula" src="20200629/1593429824621380.png" data-latex="{CO}_{2}、NO、{O}_{2}" width="110" height="32"/>

② <img class="kfformula" src="20200629/1593429824912456.png" data-latex="{H}_{2}S、{O}_{2}、{SO}_{2}" width="109" height="25"/>

③ <img class="kfformula" src="20200629/1593429824810624.png" data-latex="{N}_{2}、{H}_{2}、HC1" width="137" height="26"/>

④ <img class="kfformula" src="20200629/1593429824189949.png" data-latex="{NH}_{3}、{O}_{2}、HC1" width="128" height="26"/>

参考答案：

复制

纠错

相关题目

【单选题】在采访中，记者既要"身入"，又要"心入"。"心入"，就是要有强烈的社会责任感，要对客观事物进行由表及里的分析，还要().

① A.广泛地接触群众

② B.多方面地挖掘材料

③ C.细心地掂量各种材料的价值

④ D.细心地掂量各种材料的价值

查看完整题目与答案

【多选题】 Whatdoestheword"steal"(thelastpara.)mean?<br/>

查看完整题目与答案

【判断题】新闻用事实说话，即写出事实并把事实说清楚，是"根据事实来描写事实"而不是"根据希望来描写事实"().

① 正确

② 错误

查看完整题目与答案

【判断题】在消息写作上，要力求避免所谓的"三重复"，是指避免标题、导语、主体的重复().

① 正确

② 错误

查看完整题目与答案

【单选题】 F．H．奥尔波特（1924）指出，社会心理学是"研究个体的社会行为和（）的学科"。

① A.社会心理

② B.社会意识

③ C.社会知觉

④ D.社会观念

查看完整题目与答案

【单选题】执行下面程序：main(){intx=1,y=1,z=1;x=x+++y+++z++;printf("%d,%d,%d",x,++y,z++);}输出的结果为（）

① 4，3，2

② 3，3，2

③ 3，3，3

④ 3，2，2

查看完整题目与答案

【判断题】习近平总书记在党的十九届五中全会上提出"新发展理念"，是指：创新、协调、绿色、法治、共享。

① 正确

② 错误

查看完整题目与答案

【单选题】哪个省最早提出了“四换三名"?

① A.广东

② B.浙江

③ C.江苏

④ D.福建

查看完整题目与答案

【单选题】什么是新时代做好“三农"工作的总抓手?

① A.建设美丽乡村

② B.推动农业发展

③ C.促进农民增收

④ D.实施乡村振兴战略

查看完整题目与答案

【多选题】 “丝绸之路经济带"涉及以下哪些省份?

① A.新疆

② B.重庆

③ C.陕西

④ D.甘肃

查看完整题目与答案

【单选题】哪个省是习近平新时代“三农"思想的重要发源地?

① A.上海

② B.浙江

③ C.福建

④ D.河北

查看完整题目与答案

随机题目

【单选题】 The trade unions in this industry are ____ any reduction in wages.

① objecting against

② opposed to

③ reacted to

④ resisting against

查看完整题目与答案

【单选题】 Hurricanes are severe cyclones with winds over seventy five miles an hour ____ originate over tropical ocean waters.

① which

② who

③ where

④ how to

查看完整题目与答案

【单选题】 John’s score on the test is the highest in the class; he ____ last night.

① must study

② should have studied

③ must have studied

④ is sure to study

查看完整题目与答案

【单选题】 This is the hotel _______last month.

① which they stayed

② at that they stayed

③ where they stayed at

④ where they stayed

查看完整题目与答案

【单选题】 He doesn’ t spend much time____ his homework.

① in

② do

③ on

④ to do

查看完整题目与答案

【单选题】 People’s status in society is frequently ____ by how much they own.

① measured

② examined

③ tested

④ questioned

查看完整题目与答案

【单选题】 Jack is so ____ to his appearance that he never has his clothes pressed.

① adverse

② anonymous

③ indifferent

④ casual

查看完整题目与答案

【单选题】 It’s no good ____ him. He is always indifferent towards others’ matters.

① to turn to

② turning to

③ turn to

④ turned to

查看完整题目与答案

【单选题】 The child tiptoed（翘起脚尖走）quietly to the bird. _____ into the forest when he was about to catch it.

① Flew it away

② Away flew it

③ Away it flew

④ Flew away it

查看完整题目与答案

【单选题】 In order to prepare a lecture, one must do a lot of research and spend plenty of time____ his material so that his speech is clear and easy to follow.

① organizing

② managing

③ operating

④ breeding

查看完整题目与答案