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请教大家，我做TPO19时好几道题不明白： 12. What is the lecturemainly about? Recent advances intechnology used by astronomers How radio astronomy hasled to advances in communication technology Important discoveriesmade by radio astronomers Difficultiesastronomers have in observing the universe 我选的是A，因为感觉通篇都在讲利用radiowave观察星体啊，而且感觉通篇更侧重讲优点而不是局限？
16. According to theprofessor, why do radio astronomers sometimes have difficulty studying very distant objects? Click on 2 answers Signals from closerobjects interfere with radio waves from space. Particles in theatmosphere change the direction of radio waves. Radio waves from spaceare rest very strong. Light waves fromsources on Earth alter radio waves from distant objects 我选的AD.感觉D应该是在答案里面的？但是标准答案是AC...
希望高人解答，万分感激！
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发表于 2013-2-1 15:52:51
发表于 2013-2-1 16:23:32
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