Thursday, May 11, 2023
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下列制配单质的反应中,化合物作还原剂的是()A、锌和硫酸反应制配氢气B、溴和碘化钠反应制配碘C、在电炉中碳和二氧化硅反应制配硅D、铝和二氧化锰反应冶炼锰...
Monday, February 5, 2024
Tuesday, October 10, 2023
Saturday, March 16, 2024
萃取体系一般用“被萃取物(起始浓度范围)/水相组成/()”表示。...
Friday, January 26, 2024
Wednesday, January 3, 2024
Wednesday, January 3, 2024
Monday, February 5, 2024
Wednesday, January 3, 2024
下列各组物质相互作用能产生气体的是()A、Fe和FeCl3溶液B、H2S溶液和FeCl3溶液C、Al和NaOH溶液D、Fe和CuSO4溶液...
Monday, March 20, 2023
Monday, July 17, 2023
Saturday, March 16, 2024
Nd-Fe-B的理论磁能级是多少MGOe?()A、55B、60C、64D、66...
Friday, April 12, 2024
Friday, January 26, 2024
稀土元素按硫酸复盐的溶解度可分为()、微溶性铽组、难溶性铈组三组。...
Thursday, August 31, 2023
Friday, April 12, 2024
造成有机相流动性下降的原因有()。A、有机溶剂挥发B、萃取剂萃取量过大C、有机浓度偏低D、环境温度偏低...
Thursday, February 29, 2024
1mol的某有机化合物,可以生成4molH2O,该化合物是()A、甲醇B、乙烷C、乙烯D、丁二烯...
Thursday, February 29, 2024