Tuesday, September 13, 2022
Thursday, August 29, 2024
Sunday, January 14, 2024
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:石油产品的酸度(值)只是测定油品中的有机酸,不包括无机酸。
Friday, April 21, 2023
Tuesday, September 13, 2022
Tuesday, March 14, 2023
问题:测定运动粘度时,恒温浴温度计安装要求,要使温度计水银球的位置接近粘度计()的水平面,并使温度计上要测温的刻线位于恒温浴液面上()毫米处。
Saturday, September 10, 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: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
Tuesday, September 13, 2022
Monday, November 7, 2022
问题:重质油比轻质油()引起自燃。A、不容易B、更容易C、不好区别
Friday, September 16, 2022
Tuesday, September 13, 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
Tuesday, September 13, 2022
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
Sunday, December 31, 2023