问题:在测定IV值时,胶乳试样处理中为什么加入甲醇溶液?...
Tuesday, September 13, 2022
Tuesday, September 13, 2022
Tuesday, September 13, 2022
Saturday, September 10, 2022
Sunday, December 3, 2023
问题:若完全除去N<sub>2</sub>中混有的少量H<sub>2...
Saturday, September 10, 2022
问题:将7.63350修约为四位有效数字的结果是7.634。...
Wednesday, October 5, 2022
问题:1%酚酞的配置方法是:将g酚酞溶于60ml乙醇中,用水稀释至()...
Tuesday, September 13, 2022
Tuesday, September 13, 2022
问题:实验测得右灰石中CaO含量为27.50%,若真实值为27.30%,则(27.50%-27.30%)/27.30%=0.73%为()。A、绝对误差B、相对误差C、绝对偏差D、标准偏差...
Wednesday, October 5, 2022
问题:化验室内有危险性的试剂可分为()(毒品)和()三类....
Tuesday, September 13, 2022
问题:在分析天平上称样时,可否将手较长时间伸入天平内加减样品?为什么?...
Saturday, October 21, 2023
Friday, December 8, 2023
问题:航海指示灯灯泡可发出红色的光,是在灯泡中加入了()A、氮气B、氢气C、氧气D、氖气...
Thursday, July 20, 2023
Tuesday, September 13, 2022
Thursday, February 8, 2024
Tuesday, September 13, 2022
问题:如果粘度计放置的台面不是水平的,所测试结果是高还是低?...
Saturday, September 10, 2022
Tuesday, September 13, 2022
问题:公司分析工业用氢氧化钠应该执行什么标准?其氢氧化钠含量的测定原理是什么?...
Wednesday, January 18, 2023