第39题: [单项选择]间接配位滴定法测定氢氧化铝的含量 A. 金属指示剂 B. 吸附指示剂 C. 酸碱指示剂 D. 自身指示终点法 E. 永停指示终点法 参考答案:C
第40题: [单项选择]John has {{U}}made up his mind{{/U}} not to go to the meeting. A. wanted B. promised C. decided D. agreed 参考答案:C 答案解析:make up one's mind:打定主意,下定决心。又如:Susan has made up her mind that, come what may, she will stay with