问题:不同的分析方法对试剂也有不同的要求,如络合滴定所用的试剂最好选用...
Tuesday, September 13, 2022
Tuesday, September 13, 2022
Tuesday, September 13, 2022
Tuesday, September 13, 2022
问题:用以检定其它砝码和天平的具有较高精度的砝码称()。...
Tuesday, September 13, 2022
问题:一般瓦斯灯(如米克灯)的火焰分内层、中层、外层火焰,则()。A、外层火焰温度较低B、内层火焰温度最低C、中层火焰温度最高D、内层火焰温度最高...
Friday, April 21, 2023
Tuesday, September 13, 2022
问题:需配制10%(g/mL)NH4Cl溶液1000毫升,现有30%(g/mL)和5%(g/mL)NH4Cl溶液两种,应如何配制?...
Wednesday, December 14, 2022
Tuesday, September 13, 2022
Saturday, September 10, 2022
问题:化验室蒸馏低沸点易燃液体时,应采用密闭式电热管的()或(),尽量避免用()。...
Tuesday, February 14, 2023
Saturday, September 10, 2022
问题:把3.65克氯化氢溶解于水里制成1升溶液,这种盐酸的物质的量浓度为()A、0.1mol/LB、0.2mol/LC、0.8mol/LD、0.4mol/L...
Saturday, May 27, 2023
问题:在电解含有Ag离子的溶液时.欲使阴极析出1摩尔的银。问需通入的电量是多少?已知每个电子的电荷电量是1.602×10-19库仑,阿伏伽德罗常数NA为6.023×1023...
Sunday, December 31, 2023
Thursday, November 23, 2023
Tuesday, September 13, 2022
问题:用托盘天平称取一定数量的试样,砝码应放在左边的托盘上。...
Wednesday, October 25, 2023
Tuesday, September 13, 2022
问题:在胶质测定中,控制的浴温高于规定的温度时,造成测定结果偏大。...
Friday, February 24, 2023
Friday, September 16, 2022