皮皮学，免费搜题
登录
搜题
【单选题】
分离挥发油的羰基成分,采用亚硫酸氢钠试剂,其反应条件为()A.
回流提取
B.
酸性条件下加热回流
C.
碱性条件下加热回流
D.
低温短时间振摇萃取
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】Which of the following statements is true?
A.
The customers gave up the manners, which the English are famous for.
B.
The customers kept their temper while looking for clothes they wanted.
C.
Small children enjoyed crawling through people's legs.
D.
The security guards were fearless of the crowd.
【单选题】Which of the following is NOT mentioned as a cause to the problems of the disabled?
A.
Not enough help from relatives in their transportation.
B.
Prevailing discrimination in work place against the disabled.
C.
The ineffective system of the federal government,
D.
The courts' general favor in employers over the disabled.
相关题目：
参考解析：
知识点：
题目纠错 0
发布
