皮皮学，免费搜题
登录
搜题
【判断题】
在小烧杯内混合 1.2 g N,N- 二甲基苯胺和 1.0 mL 冰醋酸于不断搅拌下将慢慢加到上述冷却的重氮盐溶液中。加完后继续搅拌 10 min ，然后慢慢加入 25 mL 5% NaOH 溶液，直至反应物变为橙色，这时反应液呈碱性，粗制的甲基橙呈细粒状沉淀析出 。A.
正确
B.
错误
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】According to the , the Frank empire was divided into three parts.
A.
Edict of Milan
B.
Constantine's Gift
C.
Treaty of Verdun
D.
Pentateuch
【简答题】传为李昭道的作品( )是一幅以山水景物为主的历史故事画,表现唐玄宗因安史之乱避地入蜀,正与侍从嫔妃们乘马行进于蜀道万山之中的情景。
【单选题】According to the experiments conducted by Frank Keppler and his colleagues,
A.
living plants produce a high rate of methane.
B.
dead plants produce a high rate of methane.
C.
methane mainly comes from burning biomass.
D.
methane can only be produced hydroponically.
【单选题】According to Frank, why do kids get violent?
A.
Because the media teach them.
B.
Because the school is like a jail.
C.
Because the education system has problems.
D.
Because the environment makes them so.
【单选题】According to the passage, the Art Institute of Chicago______.
A.
was Frank Lloyd Wright's major studio in the U. S. A
B.
was a major organizer for the 1893 world fair in Chicago
C.
was the center for American simplistic art in the early 20th century
D.
held some important exhibitions of Frank Lloyd Wright's works and collections
相关题目：
参考解析：
知识点：
题目纠错 0
发布
