【简答题】Look at the business card and mark out what information is there on the card. company name the person's name email address company logo company address phone numbers the person's job title company web...
【单选题】Auro Construction (AC) builds electricity generation plants. Look at the Executive summaryof the Strategy Briefing Document and decide which change the company is considering.
【简答题】称取制造油漆的填料红丹(Pb 3 O 4 )0.1000g,用盐酸溶解。在热时加入25mL浓度为0.02mol·L -1 的K 2 Cr 2 O 7 溶液,析出PbCrO 4 : 冷却后过滤,将PbCrO 4 沉淀用HCl溶解。加入KI和淀粉溶液,用0.1000mol·L -1 Na 2 S 2 O 3 溶液滴定至终点时,用去12.00mL。求试样中Pb304的质量分数。[M(Pb 3 O 4 )...
【简答题】称取制造油漆的填料红丹(Pb 3 O 4 )0.1000g,用盐酸溶解。在热时加入25mL浓度为0.02mol·L -1 的K 2 Cr 2 O 7 溶液,析出PbCrO 4 : 冷却后过滤,将PbCrO 4 沉淀用HCl溶解。加入KI和淀粉溶液,用0.1000mol·L -1 Na 2 S 2 O 3 溶液滴定至终点时,用去12.00mL。求试样中Pb304的质量分数。[M(Pb 3 O 4 )...