第8题: [单项选择]某同学进行8-羟基喹啉含量测定时,称取0.0774g样品,溶于10mL冰醋酸中,加入结晶紫指示液,用c(HClO4)=0.08690mol/L高氯酸-冰醋酸标准滴定溶液滴定,消耗了5.56mL。同时做空白试验消耗0.02mL。则样品中8-羟基喹啉的含量为()。【8-羟基喹啉的相对分子质量为129g/mol】。 A. 67.9% B. 78.5% C. 80.2% D. 80.9% 参考答案:C
A. Holding the ceremony in a church. B. Composing their own vows. C. Saying vows D. Holding the ceremony outdoors. 参考答案:C 答案解析:[听力原文] 4-6 F: Mr. Smith so we were talking about rituals of cultures. And particularly the tradi