为什么在不同介质中的光速不同

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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1093479,1086580,1070284,1086504,1096473,1105029,1085142,1118134,1102172,1105107,1098545,1042066,1063867,1091625,1082363,1048422,1125195,1080086,1065765,1069221,1079315,981687,987495,1103941,1096068,1102437,1063831,1071239,1094387,1067315) ORDER BY field (ArticleID,1093479,1086580,1070284,1086504,1096473,1105029,1085142,1118134,1102172,1105107,1098545,1042066,1063867,1091625,1082363,1048422,1125195,1080086,1065765,1069221,1079315,981687,987495,1103941,1096068,1102437,1063831,1071239,1094387,1067315)