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
问题:下面()物质溅到皮肤上,用水冲后,再用25%NH<sub>3</...
Saturday, September 10, 2022
Tuesday, September 13, 2022
Tuesday, September 13, 2022
Tuesday, September 13, 2022
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
问题:易挥发物、易燃油品、溶剂等,一定要放在(),不得放在()容器内。...
Tuesday, September 13, 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
Thursday, November 23, 2023
问题:归一化法定量计算的适用性是适用于试样中所有组分都能流出色谱柱,并...
Sunday, September 11, 2022
问题:抗氧化安定性结果测出沉淀物和酸值越大则抗氧化安定性()...
Saturday, September 10, 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
Tuesday, September 13, 2022
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
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
Tuesday, September 13, 2022
Friday, September 16, 2022