光绕地球一圈走过的路程为:2*3.14*6400=40192km
光1秒饶地球圈数:300000÷40192=7.5
即约为七圈半
猜你喜欢
- 1你已学过不少描写景物的古代诗文,试着把其中描写山水的名句摘录下来,并选择一两则加以200字赏析.
- 2万有引力是物质的一种属性吗?他与物质的能量属性有什么关系?
- 3It is five years since we began to enjoy a _________spring holiday each year
- 4mechanic,the,is,hot,or,cold(连词成句)怎么连
- 5如右图,已知三角形ABC的面积是36平方分米,AD=DC,AE=EF=FB,图中阴影部分面积是多少?
- 6判断下面各题中的两种量是不是成反比例,并说明理由.
- 7He didn't have breakfast ,___ he got up late.A.because B.since C.as D.for
- 8What does it feel _____ in a boat on the lake?A lie B lies C to lie D lying 应该选什么?
- 9帮我翻译一下‘``谢谢了```You are my unique.My whole life wants to love you thoroughly.
- 10一直定义在[a-1,2a]上的函数f(x)=ax²+bx+3a+b为偶函数,则a+b=?