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. 正确 B. 错误
A. engine power losses B. smoking due to unburned fuel C. high exhaust temperature readings D. all of the above