系统机械能守恒的条件是什么

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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1104663,1067895,983947,990830,1080086,1106192,1073772,1071701,1086312,1123655,1094615,1107567,1102298,1095508,1128531,1085388,1112398,1068558,1075482,1109669,1074820,1125542,1102466,1081411,1111316,1090196,1109118,1054358,1049398,1075817) ORDER BY field (ArticleID,1104663,1067895,983947,990830,1080086,1106192,1073772,1071701,1086312,1123655,1094615,1107567,1102298,1095508,1128531,1085388,1112398,1068558,1075482,1109669,1074820,1125542,1102466,1081411,1111316,1090196,1109118,1054358,1049398,1075817)