A. 正确 B. 错误
A. 测定铁矿石中铁含量时SnCl2加入太多 B. 用于标定标准溶液的基准物吸潮了(直接滴定) C. 以EDTA标准溶液测定Ca、Mg含量时滴定速度太快 D. 测定铁矿石中铁含量时用盐酸溶解温度太高
A. engine power losses B. smoking due to unburned fuel C. high exhaust temperature readings D. all of the above