问题
单项选择题
卫星导航中，卫星升交点赤经是指（）。
A.卫星轨道面和天赤道面的交点
B.春分点和卫星升交点所夹天赤经角
C.0度经线和升交点经线的夹角
D.180度经线和升交点经线的夹角
答案
参考答案：B
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卫星导航中，卫星升交点赤经是指（）。
A.卫星轨道面和天赤道面的交点
B.春分点和卫星升交点所夹天赤经角
C.0度经线和升交点经线的夹角
D.180度经线和升交点经线的夹角
参考答案：B
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| Life today is 1 than it was hundreds of years ago, but it has 2 some new problems. One of the biggest problems is pollution. We can see it, smell it, drink it, and 3 hear it. 4 has polluted Earth. The more people, the more .because there were not 5 people. Now man is slowly polluting 6 world. Air pollution is still the most serious among (在……之中) all kinds of pollution. It is bad for all 7 animals. It is caused by heavy traffic. It is said that the situations will be much better if people ride bikes 8 driving cars. When you are riding, there is no pollution. But even in developing countries, most people don't go to work by bike. It is not because bikes are expensive or people are tired if they ride to work, but because the roads for the cars become 9 , more people put away their bikes and go to work by car or by bus, then things are getting 10 . | ||||
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