题干

2002年8月16日,参考消息报导:印度一根5世纪的铁柱至今不锈之谜终于被解开.这根重6吨的柱子耸立在新德里著名的库塔布旁边,尽管经过了1600多年的风吹雨打,它却奇迹般的几乎没有受侵蚀的迹象,经研究发现,此铁柱中含磷元素量非常高,磷元素与空气中的水蒸气和氧气发生反应形成一种保护层,保护层的主要成份是磷酸氢铁水合物[Fe2(HPO43•xH2O].此物质属于____(酸、碱、盐)其中铁元素的化合价为____,此物质____于水(填易溶或难溶).
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盐,+3,难溶

同类题1

阅读下面的文字,完成下面小题。

    春秋时代,战争是为了争夺霸权或政权,结盟聚会是为了消除冲突。冲突频繁,会盟燕享频繁,成了春秋最基本的特色。会盟要讲“礼”“赋诗”,从而造就了特殊的文化现象——“诗礼风流”。

    西周人重“礼”,是重其仪式性,如典礼仪式、揖让周旋等。而春秋则将礼认作了治国大法、人生准则。春秋从鲁隐公元年到鲁哀公十四年230余年间,谈礼之风盛行。一部《左传》,“礼”为主要的价值标准:“夫名以制义,义以出礼,礼以体政,政以正民。”“夫礼,所以整民也。”“礼之可以为国也久矣,与天地并。君令臣共,父慈子孝,兄爱弟敬,夫和妻柔,姑慈妇听,礼也。”其每评一事之得失,辄曰:“礼也”、“非礼也”;似乎国之兴亡,皆系于“礼”。

    《左传》最早一次论礼是在桓公二年,最早一次引《诗》在桓公六年,可见赋《诗》引《诗》之风与礼治思潮乃同步而兴。事实上,会盟燕享的赋《诗》引《诗》,几乎也集中在春秋时期。在会盟燕享中,列国都想用既合于礼又合于愿而又不失为大雅的手段,实现自己的目的,赋《诗》言志便成最佳选择。会盟燕享中的诗礼交锋,直接影响了士君子的价值判断与人格修养。列国名卿的外交才能,多半表现在熟谙《诗》礼、智能达变上。鲁襄公十六年,晋侯与诸侯在温地宴会,各国大夫皆赋诗言志,而齐国的高厚歌诗与舞不配,结果惹怒晋国,高厚只好落荒而逃。鲁襄公二十八年,齐国庆封逃难到鲁,叔孙豹让乐工诵《茅鸱》骂他,他竞茫然不知。鲁昭公十二年,宋华定到鲁国出差,鲁人赋《寥萧》以示友好与祝福,他毫无反应。这些在当时都是“国际笑话”。因而这个时代要求士君子必须熟谙《诗》礼,出使四方而能专对。鲁昭公七年,鲁国孟僖子陪昭公到楚国参加会盟,因不能以礼应对而抱恨终身,临终前要儿子跟孔子学礼。熟谙《诗》礼,关乎文化修养与基本素质,即春秋时所谓的“文”。鲁襄公三十一年,北宫文子评论郑国的贤臣是:子大叔“美秀而文”,公孙挥“善为辞令”。

    在礼治思潮下,整个时代的士君子,无不以《诗》礼为立身之本,以求自我实现。因此,春秋大国曾兴起研究《诗》礼的热潮;一些小国,为了交往大国,也不得不研究诗礼;连当时的戎狄也加入此列。但这时不像汉唐那样研究《诗》的本意或寻求圣人的微言,而是将《诗》认作与“礼”有诸多联系的圣典。《左传》几乎是把《诗》作为“礼经”来用的,其所有的引《诗》段落似乎或多或少都与礼有些联系。“礼”成了《诗》的第一生命。所有引《诗》赋《诗》者,无一不是精通礼仪者。

    总之,会盟燕享,促成了赋《诗》引《诗》的热潮;礼治思潮,促成了以礼为核心的诗歌解释系统的形成。在春秋会盟燕享的外交大平台上,诗与礼绾结,为狼烟四起的春秋笼上了一层温情脉脉的面纱。

同类题3

    One night, I was sitting in my kitchen half listening as my 15-year-old brother Tommy fought with my 12-year-old brother Kevin. I didn't pay attention when Kevin rushed up the stairs with the hurt on his face.
    About 20minutes later, as I was walking upstairs I heard Kevin crying inside the 1. I knocked on the door and asked, “Hey Kev, do you want to talk?” No answer. I tried again, “Hey, why don't you come out of there?” Again, no answer. So I took a stack of(一堆) cards and a pencil and wrote, “If you don't want to 2, we can write notes to each other.”
    An hour later I was 3 sitting on the floor outside the bathroom with two stacks of cards in front of me. One was blank(空白的) and the other was cards4Kevin on which he had translated all his unpleasant feelings into words for me.5 I read one of Kevin's notes, tears came to my eyes. It said, “6in this family cares about me, I’m not clever. Tommy thinks I’m a fool and Dad wishes he had the other Kevin as a kid because he’s better at basketball. And you’re never around to even 7me.”
    Tears came to my eyes as I wrote back to him. It was8what he had said about me. I wrote back, “You know Kev, I really do love you and I'm sorry I don't always show it to you. I am here for you and you are9 in this family.”
    There was no answer for a while, but then I heard a tearing sound coming from inside the bathroom. Kevin, who had 10 cards wrote on a torn-up(撕毁的) paper cup, “Thanks.”
    I wrote back “For what?” It returned to me with “loving me” written on it. Since then, I try my best to 11half notice my family members any more. Kevin and I have a closer 12  now, and sometimes when one of us notices that the other is upset we'll smile and say “Write it on a paper cup.”