Monday, February 5, 2024
问题:稀土元素加入钢中主要用途()。A、除Mn杂质B、改变杂物形态C、除碳D、细化晶粒
Sunday, November 5, 2023
Thursday, February 29, 2024
Friday, April 12, 2024
Friday, January 12, 2024
Tuesday, October 10, 2023
Saturday, March 16, 2024
Thursday, February 29, 2024
Monday, February 5, 2024
Saturday, March 16, 2024
Friday, January 12, 2024
问题: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
问题: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
问题:流体流动中服从的一般守恒原理有()。A、质量守恒原理B、能量守恒原理C、动量守恒原理D、杠杆原理
Sunday, August 20, 2023
Friday, January 26, 2024
Wednesday, January 3, 2024
Friday, April 12, 2024
Wednesday, July 26, 2023
问题: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