- UID
- 517262
- 在线时间
- 小时
- 注册时间
- 2010-3-9
- 最后登录
- 1970-1-1
- 主题
- 帖子
- 性别
- 保密
|
Q50 V32 690 没换裤子,裤裤很坚挺,大牛很多回忆很详细,整理的同学也整理的很全面,甚至阅读很多都有原文,只是LZ本人能力不济,速度太慢,题没做完(做到第33,34?道题)看来老人家还得再战… 不过还是要相当相当感谢这个月JJ整理的同学以及考古的同学,peiyabbfbl ,XYXB(看JJ的时候,看XYXB的名字一次一次的重复,感觉好亲切,也好感激…)lpilikeit, keith139 zmy19880908,seyouji还有可爱的凹凸曼同学jenny1989 ;yukizz;Frennie;还有NN loverwy,我阅读、逻辑狗狗就是在她的版本上看的,不愧是NN整理的很好,老人家我一把年纪也整理不了这么好
其次大家要注意的: 1. 数学部分 狗狗19. 告诉了直角坐标系里头的三个坐标(数字不记得),求面积。 教训:点到直线的距离一定要记住!!! (LZ当时时间太紧,做一遍过去了,没记住,结果考场上忘了,那道题磨蹭了很久,浪费了时间,估计还算了分,所以Q50,Q51的话也许就上7了,也会好看点儿)
点P(x0,y0)到直线Ax+By+C=0的距离 注意:运用本公式要把直线方程变为一般式
2. 阅读,逻辑基本都是机经 经验:大家过一遍,考场上是能帮助比自己平时提高速度的(因为你知道结构以及大概内容),但是还是要向平时一样认真看,领会文章架构,文章主旨;题目要自己看,选项要自己选
1) 阅读的长阅读是2.1.6恐龙灭绝 下面这个版本基本阐述的很详细,出题点也都在标注的里面; 注意:是三段,开头有K-T事件的;另外,第一二段分别有不同专家的观点,读的时候留意记住首字母,有两道三个题会细节考到,帮助定位
第一段:科学家猜测,65m 之前恐龙的确是被小星星撞死的(K-T extinction event事件)……(高亮Q2,有问这句话作用?)这种一瞬间的灭亡形式。这过程涉及i**元素的大量产生(有题Q4,文中说i元素地球上没有,故题目问i元素从哪里来?)从fossil中可以看出。碳同位素(其含量与生物生存所消耗和呼吸的碳相关)含量表明物种是在短时间内剧烈灭绝的。这支持了星体碰撞地球。(有题Q3)
第二段:许多科学家认为这种剧烈物种灭绝可以解释历史上其他的大的物种灭绝,比如Permian还有trissa~~什么灭绝。(接下来反驳这种观点)但实际上证据表明这两次大灭绝是gradual extinction,过程延续了几千年,有的物种灭了有的物种又恢复了。根据环境中碳的同位素检测能够发现植物的呼吸作用——动植物经历了连续的生息和灭绝(有题Q5)…如果是彗星撞地球的话要造成这样的过程那需要长达千年的时间内发生很多次的形体碰撞,这是极端不可能的。而且也没有证据表明在Permian和trissa~~时代有发生过这样的大碰撞。。(考古题目Q8
第三段:更可信的关于其他物种灭绝的说法是volcanic eruption(有题Q6)。火山爆发释放出很多温室气体,大大提高地球表温度,减少海洋水中能溶解的oxygen,因此造成了厌氧环境水体(溶氧量下降),厌氧bacteria大量繁殖,produce一种sulfer(考古题目Q9Q10),是toxic的,导致了植物的灭绝。(有题Q7)
2)最后一篇是2.2.3 测量误差 下面基本就是原文(只是LZ做到第二题还没点,时间就到了~~~~)我画绿色的部分基本就说清楚了这篇文章要阐述什么内容 Every scientist knows about measurement bias, the systematic errors that can creep into data. A simplistic example would be a metal ruler that gives inaccurate readings when it expands in warmer temperatures. Avoiding measurement bias can be impossible. Nobody’s perfect, after all, and neither is equipment. What’s important is recognizing bias and taking it into account when working with the data. But it is not always easy to detect bias. A case in point is being reported in Nature, where researchers have uncovered measurement bias in six-decades-old data on global surface temperatures. The problem arises from how British and American ships measured the temperature of surface water.
David W. J. Thompson of Colorado State University and colleagues analyzed global mean surface temperatures from the 1880s to the present, tweaking (稍稍调整) the data to remove the effects of El Niño and other “weather noise,” as Dr. Thompson described it. They discovered a sudden drop of 0.5 degree Fahrenheit in 1945, but just in data collected at sea, not on land — a hint that the drop might have something to do with the measurements.
At that time, British and American ships did much of the logging of sea temperatures worldwide. On British ships, crews measured the temperature of seawater collected in a bucket(水桶). But since about 1939, most American ships had switched to measuring the temperature of seawater as it was drawn through an intake pipe for use as an engine coolant(冷冻剂,冷却液,散热剂). Because of heat from the engine room, American measurements were generally higher.
After looking more closely at the data, Dr. Thompson said, they realized what had happened. Most of the wartime(战时) data came from American ships, with just 20 percent of the readings from British ones. But starting in August 1945, there was an abrupt switch. Nearly half the readings came from British ships. Because those readings are generally colder, Dr. Thompson said, that accounts for the sudden temperature drop.
Now that the bias has been recognized, climate researchers will need to take it into account in their models and simulations. But Dr. Thompson said the long-term trend, toward higher temperatures, would not be affected.
考个这分数,其他不觉得啥,就觉得对不住这个月的狗狗,对不住整理狗狗的同学...;后面不知道什么时候换裤,因此也不知道上面的东西对大家有没有啥子帮助 |
|