CAccording to the Union of Concerned Scientists,there are nearly 2,800 active satellites in space. We de-pend on these devices for technology we use every day,such as video calls, the Internet, GPS, online maps andweather tracking. Scientists also use them to study spaceand learn more about...
(1)推理判断题。根据第一段Why do we need so many satellites?What do they do for us?(我们为什么需要这么多人造卫星?它们为我们做什么?)可知,开头提到的中美两国发射卫星是为了引出人造卫星的功能这一话题,故选C。(2)细节理解题。根据第三段Shared bikes tha
(1)Why are satellites the US and China have sent to space mentioned at the beginning of the passage? DA.To show which country has the most satellites.B.To compare the two countries' satellite developments.C.To prove the popularity of satellites in space....
Results of these analyses are compared and concepts are tendered which would tend to minimize the radiological debris hazard to personnel and structures both on the earth's surface and in low earth orbit.doi:10.1016/0273-1177(91)90540-ZP.D. Anz-Meador...
aglass display for beauty products and beauty products (powder). 玻璃显示为美容品和美容品 (粉末)。[translate] aA Reference Guide to Active Satellites and Space Observatories of the European Space Agency 对主动卫星和欧洲航天局的空间观测所的一个参考指南[translate]...
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The four NASA astronauts currently on the ISS have either already voted or are able to vote through casting special absentee ballots using NASA's Near Space Network network of satellites and ground stations. And because most NASA astronauts live in Texas near the agency's Johnson ...
It is extremely important to design preventive measures to avoid or mitigate the influence of space weather. Severe solar activities could have a catastrophic impact on human activities in general i.e. damaging satellites, flight navigation, power distribution stations, telecommunications, etc. In this...
These results show that this approach can be useful in the search for hot-Jupiter planets that orbit around young, active stars with a v sin i of similar to 10-50 km s(-1). 展开 关键词: line: profiles methods: data analysis planets and satellites: detection planets and satellites: ...
But for astronauts(宇航员) in space, they need to use special ways to protect themselves from them, said Xinhua. For example, they won't go on spacewalks when there are "sun storms". Also, the particle storms may stop some satellites(卫星) from working, so they may bring trouble to ...