题目内容
某试样中含有约5%的硫，将其氧化为硫酸根，然后沉淀为硫酸钡，若要求在一台感量为0.1mg的天平上称量Ba2SO4的质量的相对误差不超过0.1%，至少应称取试样的质量为（）
查看答案
搜索结果不匹配？点我反馈
更多问题
容量分析中实验用的仪器是分析天平和50毫升滴定管，某学生将称样和滴定的数据记为0.25g和24.1mL，正确的记录应为 g和 mL。
梁在横向力作用下发生平面弯曲时,横截面上 。
对于等直梁,在以下情况中, 是错误的。
Group 1:1. ______ results show that the vaccine is effective, but this has to be confirmed by further medical trials.2. Could you ______ one or two points about how to use this new computer program for me?3. The accident ______ a tight link between the two families.4. We ______ to the view that things are either totally good or totally bad.5. I wish my son would show more ______ and go out and seek a good job.A. clarify B. Preliminary C.incline D. initiative E. forged
微信支付 
支付宝支付