Thursday, September 15, 2022
问题:有机化合物根据分子中碳原子连接方式,分成()烃、()烃、芳烃三类。
Friday, December 2, 2022
Thursday, January 19, 2023
Thursday, September 15, 2022
Thursday, September 15, 2022
Wednesday, October 12, 2022
Thursday, September 15, 2022
Tuesday, July 23, 2024
Thursday, October 31, 2024
问题: 一台氢型强酸阳离子交换器的直径2.5m,采用浓度1%的硫酸溶液再生,每次再生耗用96%的硫酸400kg,再生时间1h,求此交换器再生流速多少?
Saturday, November 4, 2023
Thursday, September 15, 2022
Monday, September 12, 2022
问题:测CU、Fe所用器皿必须先用()浸渍或煮洗,然后用()反复清洗后才能使用。
Thursday, September 15, 2022
Thursday, September 15, 2022
问题:测生水硬度应用()缓冲溶液。A、氨—氯化铵B、硼砂C、醋酸--醋酸铵
Sunday, March 3, 2024
问题:分光光度法中应按绘制工作曲线的同样条件测定水样吸光度,这些条件是()、()、参比物和显色方法。
Monday, September 12, 2022
Thursday, September 15, 2022
Saturday, April 13, 2024
问题:[H+]=10-2时,溶液显()性。A、酸B、中C、碱
Thursday, September 15, 2022
Saturday, July 20, 2024