Directions:Suppose that you cannot return the book to William in person for some emergency and will ask someone else to return it.1) Give your suggestions, and explain the reasons.2) Other recommendation.Write a note in about 100 words to inform him of it. Write it neatly on ANSWER SHEET 2.Do not sign your own name at the end of the letter. Use" Zhang Wei"instead.
将以下数字修约为四位有效数字:387026().
A. 3.870
B. 3.871
C. 3870
D. 3.870×104
E. 3.870×105
药物与特征反应 与碘试液反应
A. 苯巴比妥
B. 巴比妥酸
C. 硫喷妥钠
D. 司可巴比妥钠
E. 异戊巴比妥
下列各指示液分别与哪些滴定方法相对应 铈量法
A. 酚酞
B. 碘化钾-淀粉
C. 溴麝香草酚蓝
D. 结晶紫
E. 邻二氮菲