题干

在一定温度下,容积相同的两个密闭容器中,一个充入2 mol SO2、1mol O2,一个充入2 mol SO3,发生反应,当均达到化学平衡时,下列六种说法中正确的有几种?(   )                                                                                                                                                                                                          
①二氧化硫的转化率与三氧化硫的分解率之和为1,②达到平衡所需的时间相等,③密度相等,④压强相等,⑤放出与吸收的热量相等,⑥二氧化硫的浓度相同。

A:3种

B:4种

C:5种

D:6种

上一题 下一题 0.0难度 选择题 更新时间:2020-03-25 08:40:45

答案(点此获取答案解析)

B

同类题3

任务型阅读

    Small talk is the short conversations we have at parties, while we wait in line at the store, at family events or work. Sometimes we make small talk with people we already know but not well. Often we have to make small talk with complete strangers.____ Here are some tips to improve your small-talking ability.

    ⒈____

    If you have seen a really good movie or have read a really good book, you can talk about that.

    When you are sharing the same experience with someone, it's easy to start a conversation. You simply notice and comment on what's going on around you. For example, if you are at a party and a song comes on that you like or that reminds you of something, you can talk about that.

    ⒉Ask open-ended questions

    These types of questions require more thought and more than a simple one-word answer.____ the conversation will go on longer.

    ⒊Become a student

    Nobody knows everything. So,as someone is answering one of your open-ended questions, they bring up something about which you know nothing. So, tell them! This lets the other person become the teacher.____ It's a win-win situation.

    Like anything, getting good at making small talk takes practice.____you might become happier. If you are making small talk using English, you will most definitely improve your speaking and listening skills.

A. Have some conversation starters ready

B. If you make small talk in your native language

C. However, some people are not good at small talk

D. If you ask questions that need more details to answer

E. You can talk about something that you recently learned

F. Many people find these small conversations about random topics easy

G. They feel good about sharing their knowledge and you get to learn something

同类题4

阅读下文,回答相关问题

悠长的铃声
毕淑敏
雨天,是城市的忌日。 
花花绿绿的伞,填满每条街道,到处堵车。我大清早出门,赶到读书的学院,还差一分钟就要上课了。
“今天你晚了。”看大门兼打铃的老师傅说。他瘦而黑,像一根铁钉。别的同学都住校,唯我走读。开学才几天,他这是第一次同我讲话。
“不晚。”我撒腿就跑。从大门口到教室的路很长,就是有本·约翰速度再加了兴奋剂,也来不及。课堂纪律严格,我只是想将损失减少到最小。
上课的铃声在我背后响起来了,像一条鞭子,抽我的双腿。有一瞬,几乎想席地坐下,喉咙里发咸,仿佛要吐出红色来。迟到就迟到吧!纪律虽严,健康还是最重要的!
我的脚步迟缓下来,仿佛微风将息的风车。然而铃声还在宁静而悠远地响着,全然没有即将沉寂的细弱。   
只要铃声响着,我就不该停止奔跑,我对自己说。
终于,到了。
老师和同学们都在耐心地倾听着,等待铃声的完结。 
放学时,我走过大门,很想向老人表示感谢。可是,说什么好呢?说谢谢您把铃绳拽得时间那么长吗?我想在学府里,最好的谢意莫过于知识者对普通人的尊敬,便很郑重地问:“老师傅,您贵姓?”
“免贵”,然后,他告诉我姓氏。
我的脑幕上管记忆一般人姓氏的区域,似乎被虫蛀过,总是容易搞错。不过这难不住我,我创造了联想方式。比如,听了看门师傅的姓氏,我脑海中就幻化出花果山水帘洞的景象。这法子秘不传人,却是百试百灵的。 
上学三年,我认真称呼他的机会并不多。唯有恰恰赶在上课铃响之时,我经过校门,才会恭恭敬敬地称他一声:“侯师傅好!”若是他一个人,会冲着我宽厚地笑笑。有时围着做饭、植花的其他师傅,我便格外响亮地招呼他,表示我对他的尊重。周围的人看着他嬉笑,他就不好意思地低下头。其后,便会有悠长的铃声响起,像盘旋的鸽群,陪伴我走进教室。
当我伸直双腿安稳地坐在课桌前,铃声才像薄雾一般散去。“看门的老头拽着铃绳睡着了。”同桌说。只有我知道这秘密,但我永远不会说。说出来,便破坏了这一份温情,这一番默契。
终于,我以优异的成绩良好的品行,从学院毕业。我拎着沉重的书包走出校门,最后一次对铁钉样的老人说:“师傅好!”他瞅瞅四周无人,靠近我:“你就要走了。我想同你说一件事。”
“你不要放在心上……”他又踌躇了,“我只是想告诉你…… 唉,不说了……不说了
……”他苍老的头颅在秋风中像芦花一般摆动着,脸色因为窘迫,像生了红锈。
“到底是什么事呢?”我的好奇心发作了。
“他们说你是成心的,我说不是……”老人舔了一下嘴唇,好像那里粘着一粒砂糖,慈善地看着我。
“您快说嘛!侯师傅!”听这口气,与我有关,忙不迭地追问。   
“你千万别介意……我不是姓侯,我姓孙……”
(选文有改动)