题干

下列各物质或微粒性质的比较中正确的是

A:沸点:H2O>H2S>H2Se

B:热稳定性:H2CO3>NaHCO3>Na2CO3

C:半径:Cl<Cl-<S2-

D:酸性:H2CO3<HNO3<H3PO4

上一题 下一题 0.0难度 选择题 更新时间:2011-11-28 01:13:47

答案(点此获取答案解析)

C

同类题2

阅读下列名著选段,完成下列各题。

                                                                                                   (A)

      不多时,只听得街上锣鼓喧天价来。石秀在楼窗外看时,十字路口,周回围住法场,十数对刀棒刽子,前排后拥,把卢俊义绑押到楼前跪下。铁臂蔡福拿著法刀;一枝花蔡庆扶著枷梢说道:“卢员外,你自精细著。不是我兄弟两个救你不得,事做拙了。前面五圣堂里,我己安排上你的坐位了,你可以一块去那里领受。”说罢,人丛里一声叫道:“午时三刻到了。”一边开枷。蔡庆早拏住了头,蔡福早掣出法刀在手。当案孔目高声读罢犯由牌。众人齐和一声。楼上石秀只就一声和里,掣出腰刀在手,应声大叫:“梁山泊好汉全伙在此!”蔡福蔡庆撇了卢员外,扯了绳索先走。石秀楼上跳将下来,手举钢刀,杀人似砍瓜切菜,走不迭的,杀翻十数个;一只手拖住卢俊义,投南便走。

                                                                                                   (B)

      当黄胡子押送兵走到保尔跟前的时候,保尔猛然向他扑去,抓住他的步枪,狠命向下压。

      刺刀啪嗒一声碰在石头路面上。

      佩特留拉匪兵没有想到会有人袭击,愣了一下。他立刻尽全力往回夺枪。保尔把整个身子的重量都压在枪上,死也不松手。突然一声枪响,子弹打在石头上,蹦起来,落到路旁的壕沟里去了。

      朱赫来听到枪声,往旁边一闪,回过头来,看见押送兵正狂怒地从保尔手里往回夺枪。那家伙转着枪身,扭绞着少年的双手。但是保尔还是紧紧抓住不放。押送兵简直气疯了,猛一使劲,把保尔摔倒在地。就是这样,枪还是没有夺走。保尔摔倒的时候,就势把那个押送兵也拖倒了。在这样的关头,简直没有什么力量能叫保尔撒开手里的武器。

      朱赫来两个箭步,蹿到他们跟前,他抡起拳头,朝押送兵的头上打去。紧接着,那个家伙的脸上又挨了两下铅一样沉重的打击。他松手放开躺在地上的保尔,像一只装满粮食的口袋,滚进了壕沟。

同类题4

完形填空

    I was sitting the surgical waiting area at the hospital waiting for word of my wife's operation The small room was filled with other families and friends,who were1waiting to hear how their loved ones were doing.

    There was a young boy siting quietly in the2He held a small box of 3in one hand and a tablet(写字板)in the other Every so often he'd place the tablet on his lap and draw something.As the hours passed I began to see the room almost4And there was a strange silence.

    "Daddy, when is Mommy going home?"the young boy asked,breaking the 5

    "Tomorrow." his father replied The boy picked up his crayons(蜡笔)and6something on the tablet.

    I7 him as he moved his feet back and forth,looking up at the ceiling and then toward the sunshine-filled window.When's8Daddy?"he asked. His father 9 him over to sit by him."Come,10here next to me."he said with a gentle tone in his voice11his things,the little boy walked slowly to his father's side from the corner.The man12out and held his son by his shoulder.

    There are three days in life Yesterday today and tomorrow.One is over and done,one we live in,the other we 13We cant live in yesterday, but if we are happy enough today. we will be even happier tomorrow."he said in an attempt to14the boy.

    The little boy looked at him for a moment and said."If Mommy is going home tomorrow.I'll be15So.I want it to be tomorrow already. Daddy"

    Now hanging on every word of this16I leaned forward to hear his response.It was17.

    “Son, the one great thing about today is once it18it is already almost tomorrow.”

    I thought about how19 it was. Even in my adult life,I still live waiting for what tomorrow may 20.

    Now I know that it is already“almost tomorrow”.