什么是异面直线所成的角如何计算

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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1063735,1133355,1067351,1042020,1071265,1132859,1078521,1106697,999426,1083249,1057770,1091362,1041439,1073772,1079051,1125059,1072314,1041948,1100873,1127839,1088490,1047767,1062826,1074532,1091097,2247196,1070848,1051403,1063619,1059352) ORDER BY field (ArticleID,1063735,1133355,1067351,1042020,1071265,1132859,1078521,1106697,999426,1083249,1057770,1091362,1041439,1073772,1079051,1125059,1072314,1041948,1100873,1127839,1088490,1047767,1062826,1074532,1091097,2247196,1070848,1051403,1063619,1059352)