[单项选择]已知在硫酸铈测定吩噻嗪类药物的过程中,铈离子由+4价变成+3价,而吩噻嗪失去两个电子,则用0.1mol/L的硫酸铈滴定液滴定吩噻嗪时,lml的滴定液相当于mg的吩噻嗪(已知该吩噻嗪类药物的分子量为355.33) A. 21.01 B. 17.77 C. 8.88 D. 35.53 E. 71.07
第31题: [单项选择]Which hotel is the woman stayingWhen does the plane take off A. 4:15 B. 4:50 C. 4:55 参考答案:C 答案解析:[解析] Man: When does the plane take off Woman: It is due to take off at four fifteen but it’s