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2009年7月，发生本世纪罕见的一次日全食．当时南平地区天气晴好，大家可以看到日食现象．日食现象可以用我们的光 ______的道理来解释．“嫦娥一号”卫星在绕月轨道上运行是通过 ______向地面传回信息的．光的传播速度为3×10 8 ______（选填“m/s”或“km/h”）．
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