化学分析中的当量是什么如何计算

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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1103384,1068558,1073387,1106960,1076490,1070650,997352,1132313,1048878,1117207,1128045,1080593,1102814,1093513,1089454,1078414,2390057,1109497,1079862,1085388,1075635,1102388,1086063,1080118,1075907,1129293,1076241,1095223,1084471,1073322) ORDER BY field (ArticleID,1103384,1068558,1073387,1106960,1076490,1070650,997352,1132313,1048878,1117207,1128045,1080593,1102814,1093513,1089454,1078414,2390057,1109497,1079862,1085388,1075635,1102388,1086063,1080118,1075907,1129293,1076241,1095223,1084471,1073322)