问题:一般对标准物质和成品分析,准确度要求高,应选用国家、部颁标准等标准分析方法。()
Sunday, August 18, 2024
Tuesday, September 13, 2022
问题:滴定管在使用前应洗涤干净,并用待装的标准溶液洗涤2—3次,以免装入的标准溶液被稀释。()
Tuesday, September 13, 2022
问题:测pH值时如水样太脏,可采用哪种方法处理水样()。A、加热蒸发B、静止沉淀C、过滤D、树脂交换
Friday, April 5, 2024
Saturday, September 10, 2022
Tuesday, September 13, 2022
问题:清洗滴定池应用()洗涤。A、三氯甲烷B、乙醇C、汽油D、丙酮
Friday, July 14, 2023
问题:pH=4.30该数有三位有效数字,10.65修约只保留一位小数得10.6。()
Tuesday, September 13, 2022
Wednesday, April 3, 2024
Saturday, September 10, 2022
问题:用于加热的玻璃仪器的受热部位不能有()、()或壁厚不均匀。
Tuesday, September 24, 2024
问题:分析甲醇中酸的质量分数时,你发现其过程与日常不同,即加入溴百里香酚兰后呈蓝色,此时你应该怎样做?
Saturday, September 10, 2022
Tuesday, September 13, 2022
Saturday, September 10, 2022
Tuesday, September 13, 2022
问题:接触甲醇,救治方法()。A、皮肤污染用清水冲洗B、溅入眼内,立即用2%碳酸氢钠冲洗C、溅入眼内,立即用2%盐酸冲洗D、皮肤污染用汽油冲洗
Saturday, January 6, 2024
Thursday, January 26, 2023
Tuesday, September 13, 2022
Wednesday, April 3, 2024
Friday, September 27, 2024