Thursday, September 15, 2022
Tuesday, January 24, 2023
Thursday, January 12, 2023
Wednesday, December 28, 2022
问题:在一场坝中距一点声源5米处测得声级为85dB如距点声源20米处,...
Thursday, September 15, 2022
Thursday, January 12, 2023
Wednesday, August 9, 2023
问题:计算0.10mol/LNH<sub>4</sub>Cl溶液的pH...
Tuesday, September 13, 2022
问题:将2.265约为两位有效数字,其结果为()。A、2.26B、2.3C、227...
Saturday, January 28, 2023
问题:为了提高分析结果的准确度,必须()A、消除系统误差B、增加测定次数C、多人重复D、增加样品量...
Thursday, October 13, 2022
Thursday, September 15, 2022
Thursday, September 15, 2022
Thursday, September 15, 2022
Thursday, September 15, 2022
问题:用氟电极性测定水中氟时,其回归方程为E=E。-Klgc式中;K=59.0;试计算;1.0mv电位差变化,浓度变化的大小?...
Saturday, November 11, 2023
Tuesday, September 13, 2022
问题:室温下H<sub>2</sub>CO<sub>3</sub>饱和...
Thursday, September 15, 2022
Thursday, September 15, 2022
问题:把140克95%的硫酸和174克15%的硫酸混合后溶液的百分比浓度是多少?(指质量百分比浓度)。...
Tuesday, March 28, 2023
问题:用电极法测定水中氟化物时,加入总离子强度调节剂的目的是()...
Sunday, September 11, 2022