某有机物A的蒸汽与相同状况下同体积氢气的质量比是30,取有机物A 6.0 g完全

题型:计算题

问题:

某有机物A的蒸汽与相同状况下同体积氢气的质量比是30,取有机物A 6.0 g完全燃烧后,生成0.2 mol CO2和0.2 mol H2O。此有机物既可与金属钠反应,又可与氢氧化钠和碳酸钠反应。

(1)计算有机物A的分子式。

(2)根据该有机物A的性质,写出其结构简式。

考点:炔烃的通性烷烃的通性烯烃的通性芳香烃的通式
题型:计算题

四川省汶川县发生强震后,相关部门对受灾群众聚居点进行卫生清理和消毒,这在预防传染病的措施中属于______.

题型:计算题
I was on the shoulder of a busy highway in Chicago, looking at my tool-box and spare tire (备用轮胎). I had   31  tires before—that was not a big deal—but I was   32  about being approached by another person while stuck on the side of the road, or being   33  by a passing car.
As I bent into the trunk (后备箱), I heard a man’s   34  from behind and to my left. I had no idea what he said,   35  when I heard his voice I screamed and ran toward the   36  building. After a moment I realized he wasn’t  37  me, so I turned to see what he was doing.
38 , I saw a minibus full of boy scouts (童子军队员). They then   39  in front of my car. And I heard the man tell the boys to remove the spare tire from my trunk to   40  my flat! As I timidly (胆怯地) walked back, I could hear him speaking to the   41 .
“See, boys,” he said to them, “this young lady is terrified, and for good   42 . Thousands of young women are   43  every year. She did the right thing   44  like that.” He then told the boys how they, as men, are   45  not only for   46  and protecting them. After he made that  47 , he gave step-to-step instructions on changing a flat on the side of the road   48 .
The boys learned a lot that day, and so did I. I’m so grateful there are   49  men in the world. I saw one,   50  our youth to be honorable, making the world a safer place for women, for everyone.
小题1:
A.lostB.changedC.boughtD.cleaned
小题2:
A.certainB.disappointedC.curiousD.worried
小题3:
A.stoppedB.pulledC.hitD.ignored
小题4:
A.voiceB.cryC.shoutD.laughter
小题5:
A.ifB.becauseC.althoughD.unless
小题6:
A.nearestB.oldestC.sameD.last
小题7:
A.askingB.upsettingC.followingD.hurting
小题8:
A.ConfidentlyB.CalmlyC.GladlyD.Surprisingly
小题9:
A.restedB.gatheredC.playedD.ate
小题10:
A.fixB.chooseC.makeD.reach
小题11:
A.policemanB.ladiesC.boysD.passengers
小题12:
A.measureB.behaviorC.reasonD.health
小题13:
A.injuredB.chargedC.blamedD.attacked
小题14:
A.singingB.runningC.jumpingD.trying
小题15:
A.responsibleB.gratefulC.anxiousD.famous
小题16:
A.appealing toB.aiming atC.bringing upD.watching over
小题17:
A.decisionB.pointC.mistakeD.promise
小题18:
A.naturallyB.frequentlyC.safelyD.easily
小题19:
A.strongB.happyC.braveD.honorable
小题20:
A.allowingB.warningC.orderingD.teaching
题型:计算题

最高运行速度160km/h的旅客列车,在任何线路上的紧急制动距离限值为()。

A、800m

B、1100m

C、1400m

D、2000m

题型:计算题

仔细观察下面这幅漫画,回答问题。                

(1)用说明性语言简要介绍画面的内容。

    答:                                                                                                                             

(2)请谈谈你对“一本好书,一生财富”的认识。

    答:                                                                                                                                                    

题型:计算题

肾气实,发长齿更()

A.八岁

B.二八

C.三八

D.四八

E.五八

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