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人造卫星在地球引力作用下沿平面椭圆轨道运动,地球中心点可以看作固定点,且为椭圆轨道的一个焦点,地球和卫星看作质点。卫星近地点离地面的距离为439Km,远地点离地球的距离为6370Km,若卫星在近地点的速度为8.12Km/s,则在远地点的速度为(_ _)Km/s
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举一反三
【判断题】Cultural identity achievement stage is characterized by a clear, confident acceptance of oneself and an internalization of one's cultural identity.
A.
正确
B.
错误
【简答题】阅读理解。 She is a cute, quiet girl. As a daughter, she has no secrets from her mother, who is very pleased with her. But these days she has become not so open as before. She has a diary that she keeps un...
【简答题】用所给单词的适当形式填空。 1. The girl is very quiet and doesn't enjoy _____ (go) to the party. 2. Wei Hua has _____ (curly) hair than Li Hong. 3. Her skirt is _____ (red) than mine. 4. The young man is _____ (un...
【简答题】An example of a cultural and artistic portrayal of meat-eating plants
【判断题】Please decide whether these postures are appropriate for business occasion or not. (appropriate=T, inapporpriate=F)
A.
正确
B.
错误
【单选题】What is not an example of cultural differences?
A.
How we speak to and touch our friends
B.
The currency we use to pay for things.
C.
How close we stand to each other in a business setting.
D.
How we use gestures.
【单选题】2019 年 3 月 4 日下午,习近平总书记看望参加全国政协十三届二次会议的文化艺术界、社会科学界委员时指出,文艺创作、学术创新要以人民为中心、以精品奉献人民、用明德引领风尚。这表明( ) 1 人民群众是社会历史的主体,是社会精神财富的创造者 2 群众观点是无产阶级政党的根本的领导方法和工作方法 3 文艺工作者必须牢固树立为人民服务的思想 4 立足于群众的需要,是党和文艺工作者一切工作的根本出发...
A.
①②
B.
②③
C.
①③
D.
②④
【简答题】根据汉语提示写出单词 1、 She is really sorry to ______(不及格 )the Chinese exam. 2. Miss Gao has over ten years teaching _______(经验). 3.All the students agree with my____________(建议). 4. She is a quiet girl.S...
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