题目内容

阿司匹林中水杨酸检查的方法为:( ).

A. 灵敏度法
B. HPLC法
C. GC法
D. TLC法

查看答案
更多问题

用酸碱滴定法测定阿司匹林含量时,溶剂为______, 滴定液为____,指示终点的方法为____.

A. 中性乙醇;氢氧化钠滴定液;酚酞指示液指示终点;
B. 水;氢氧化钠滴定液;酚酞指示液指示终点;
C. 水;氢氧化钠滴定液;永停滴定法指示终点;
D. 中性乙醇;氢氧化钠滴定液;永停滴定法指示终点;

将预习中不能解决的问题标出来,并写到后面[我的疑问]处

Mozart _____ more than 600 pieces of music.

A. writes
B. wrote
C. is writing
D. has written

I _____ in this village for eight years, and then to Beijing.

A. lived; move
B. live; move
C. lived; moved
D. lives; moves

答案查题题库