国家颁布的五日生化需氧量(BOD5)的测定标准分析方法为(),方法的国标号为GB7488-87。...
Friday, September 16, 2022
Thursday, September 22, 2022
Thursday, September 22, 2022
单选题汞离子与双硫腙形成()螯合物。A 红色B 淡红色C 橙色D 蓝色...
Friday, July 14, 2023
将PH=11的水溶液稀释100倍,此溶液的PH为()。...
Thursday, September 22, 2022
Thursday, September 22, 2022
Thursday, September 22, 2022
用邻二氮杂菲测铁时,为测定最大吸收波长,从400nm~600nm,每隔10nm进行连续测定,现已测完480nm处的吸光度...
Thursday, September 22, 2022
多选题气液色谱填充柱的制备过程主要包括()。A柱管的选择与清洗B固定液的涂渍C色谱柱的装填D色谱柱的老化...
Friday, June 16, 2023
多选题配制HCl标准溶液宜取符合标准的试剂规格是()。AHCl(AR)BHCl(GR)CHCl(LR)DHCl(CP)...
Monday, March 11, 2024
Thursday, September 22, 2022
单选题水样容器必须用硼硅玻璃材质的项目是()A 酚B 叶绿素aC 细菌总数D 总硬度...
Friday, June 2, 2023
Friday, September 16, 2022
Thursday, September 22, 2022
填空题测定水中微量、痕量汞的特效监测方法是冷原子吸收法和冷原子荧光法。这两种方法()。...
Saturday, April 27, 2024
Thursday, September 22, 2022
单选题滴定分析到了终点时,用去20mL标准溶液,应记录为()A 20mLB 20.0mLC 20.000mLD 20.00mL...
Tuesday, December 5, 2023
在适当的pH值条件下,水中钙镁离子可与EDTA发生()反应。...
Thursday, September 22, 2022
河流采样削减断面宜设在城市或工业区最后一个排污口下游500米以外的河段上。...
Thursday, September 22, 2022