Friday, September 16, 2022
Tuesday, September 13, 2022
Tuesday, September 13, 2022
Tuesday, September 13, 2022
Tuesday, September 13, 2022
Saturday, September 10, 2022
Tuesday, September 13, 2022
Tuesday, September 13, 2022
Saturday, September 10, 2022
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
Friday, April 21, 2023
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
Saturday, September 10, 2022
烧伤的伤势一般按烧伤的深度不同可分为()度,一度烧伤只损坏(),...
Tuesday, September 13, 2022
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
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
用()式表示化学反应的式子叫化学方程式。A、原子B、分子式C、中子...
Wednesday, December 14, 2022
滴定分析法比较准确、简单,在一般情况下,测定的相对误差在()左右。A、0.2%B、0.5%C、2%D、5%...
Saturday, March 9, 2024
Tuesday, December 12, 2023
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