煤中的粘土类矿物质如,在浮选过程中会发生泥化。
A.炭质页岩
B.碳酸盐
C.高岭土
D.泥质页岩
E.粘土
参考答案:C, D, E
在常温下,发生下列几种反应:① 16H+ + 10Z— + 2XO4—= 2X2+ + 5Z2 +8H2O
② 2A2+ + B2 = 2A3+ + 2B— ③ 2B— + Z2 = B2 + 2Z—
根据上述反应,判断下列结论中错误的是:
A 溶液中可发生:Z2 + 2A2+ = 2A3+ + 2Z— B Z2在①、③反应中为还原剂
C 氧化性强弱的顺序为:XO4—>Z2>B2>A3+ D X2+是XO4—的还原产物
I had Mr Ding this morning. [ ]
A. interviewed
B. an interview with
C. interview to
D. an interview to