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A tornado (龙卷风) is a kind of strong storm with air which moves in a circle quickly. They can move over 200 miles per hour and cause a lot of damage (损坏). As they move across the land, they can easily pick up cars, trucks, and even houses, and then throw them very far. It is important to find a safe place if a tornado gets close.
A safe place could be a basement ( 地下室) or the lowest floor. If you are in a home without a basement, try to find a first-floor bathroom or a small room without windows in the middle of your house. You should curl up (蜷缩) into a ball and cover your head and neck with your hands.
But there are some people who actually want to get close to tornadoes. They are scientists who want to learn more about tornadoes. One of the best ways to do this is to get as close as possible to the tornado. They use special tools to measure (测量) what is happening in and around a tornado.
One special tool is called a tornado probe ( 探测仪). Inside the tornado probe, there are sensors (传感器) to measure wind speed, temperature, pressure, and direction.
Some probes even have cameras, so the scientists can see and understand what it's like to be in a tornado.
To be able to get these measurements, the scientists have to get a tornado probe near or into a tornado. Scientists will try to guess where a tornado will go next. Then they drive to that location and put down the probe. If they do not guess correctly, they pick up their probe and try another place. If they are right, the tornado will go near or even right over the probe. Then they take all of the measurements
from the probe and use them to predict where future tornadoes may form (形成) and travel. And they can give people some warning to keep away from a dangerous tornado.
A: I like English very much.
B: 2
A: No,never. I'm a little shy.
B: Don't be nervous. The most important thing for you is that you should open your mouth and speak.
A: You're right. How can I do it?
B: Then you can talk with one or two friends. Then talk with more people.
A: Yeah. I'll do as you tell me.
A. That sounds great. B. How do you study English? C. Do you often go to the English corner? D. I don't know how to talk with others in English. E. If you are afraid of talking with others, you can speak aloud to yourself first. F. My English is very good. G. But I am not good at speaking. |
①金属材料 ②无机非金属材料 ③合成材料 ④纳米材料
实验原理:Na2CO3+H2SO4=Na2SO4+H2O+CO2 ↑
通过实验测定反应产生的二氧化碳的质量,即可求得原样品中碳酸钠的质量,进而求得碳酸钠在样品中的质量分数。
实验装置:
实验步骤:
② 如图连接装置(除B,C外)并加入所需药品。
②称量并记录B的质量(m1)。(称量时注意封闭B的两端。)
③ 按动鼓气球,持续约1分钟。
④ 连接上B、C。
⑤ 打开分液漏斗F的活塞,将稀硫酸快速加入D中后,关闭活塞。
⑥ 按动鼓气球,持续约1分钟。
⑦ 称量并记录B的质量(m2)。(称量时注意封闭B的两端及E右端的出口。)
⑧计算。
干燥管C的作用是;E装置的作用是。
步骤③中鼓气的目的是,步骤⑥中鼓气的目的是。
本实验能否同时省略③、⑥两个步骤?,原因是。
实验序号 | 1 | 2 | 3 |
电阻(Ω) | 10 | 20 | 40 |
电流(A) |
| 0.10 | 0.05 |
①庚子年伊始,新冠肺炎疫情突发。这是一场全人类与病毒的战争,中国人民经过艰苦卓绝的努力取得抗疫阶段性成果。这一成采的取得离不开中国制度的优势和经济科技等方面的实力,也与中国人民敢于担当的精神和服从大局的意识息息相关。
②敢于担当的精神,在疫情期间得到了充分体现。担当意味着要有强烈的社会责任感,也意味着在关键时刻能将国家、集体的利益置于个人利益之上。疫情期间,有一张广为流传的照片戳中了人们的泪点:钟南山院士靠在车座上闭目小憩,脸上是难以掩饰的疲惫。这是因为钟老匆忙奔赴疫区,没有时间好好休息。一位84岁的老人,不亲赴抗疫一线本无可厚非,但他首先想到的是为抗疫尽自己的力量,不顾劳累与安危,毅然决然奔赴疫区。从年事已高的院士专家,到90后、00后的年轻医护人员,他们面对疫情义无反顾,坚定前行,承受难以想象的身体和心理压力,做出了巨大牺牲。他们勇敢承担起社会责任,以对人民的赤诚和对生命的敬佑,争分夺秒,连续作战,挽救了一个又一个垂危生命,为病毒肆虐的漫漫黑夜带来了光明,守护了国家和民族生生不息的希望。
③抗疫英雄敢于担当,奋战在前线,广大民众也自觉服从大局,为抗疫取得阶段性成果做出了贡献。疫情突发正值春节假期,国家一声令下,全民响应,人们取消了春节期间的走亲访友和各种聚会,克服困难就地隔离。武汉人民、湖北人民顾全大局,顽强不屈,为阻击病毒做出巨大贡献。他们面对离汉离鄂通道关闭后交通停滞、城市“停摆”,克服了近距离接触病毒、物资紧张以及长时间隔离带来的国难,服从大局,咬紧牙关,团结坚守。在这场伟大的抗疫战争中,英雄的武汉人民、湖北人民将载入史册,为人们所铭记。
④医务工作者等抗疫一线的广大勇士逆行出征,不惧牺牲,用血肉之躯构筑起阻击病毒的铜铁长城:他们是栋梁,体现了敢于担当的精神。广大民众在疫情期间以国家利益为重,响应国家号召,约束自我,居家隔离;他们是基石,体现了服从大局的意识。有栋梁,大厦将倾;没有基石,栋梁也将失去支撑。由此可见,____________,国家兴亡,匹夫有责。14亿中国人民都是抗击疫情的伟大战士。
(甲)首段提出中心论点:在中国人民艰苦卓绝的努力下,中国抗击新冠肺炎疫情取得阶段性成果。
(乙)第②段列举钟南山院士和年轻的医护人员勇赴疫区的事例,意在证明有担当精神的人不分年龄大小。
(丙)第③段由之前的论证过渡到论述广大民众服从大局的意识,并用全国人民、武汉人民、湖北人民的事例来论证。
材料:
所有好的做法如果想要奏效,必须要有公众的集体意愿。正因如此,中国有能力通过传统公共卫生干预方法应对一种新型的未知病毒。
——布鲁斯·艾尔沃德(世界卫生组织总干事高级顾问)
【注释】①(传统公共卫生干预)用提倡戴口罩、限制大众集会等手段来保障人民大众健康。