题干

检验溴乙烷中是否有溴元素,主要的实验方法是(  )

A:加入氯水后振荡,看水层是否有棕红色的溴出现

B:加入硝酸银溶液,再加稀硝酸,观察有无黄色沉淀生成

C:加入NaOH溶液共热,冷却后加硝酸银溶液,观察有无浅黄色沉淀生成

D:加入NaOH溶液共热,冷却后用过量稀硝酸中和过量碱后,再加硝酸银溶液,观察有无浅黄色沉淀生成

上一题 下一题 0.0难度 选择题 更新时间:2019-11-14 09:43:39

答案(点此获取答案解析)

D

同类题3

阅读理解。

Soap operas from South Korea have been popular in China for more than twenty years now. So it is not the first time for the soap operas made in China to feel less popular. But this time, they are facing more difficulties, for The Heirs (继承者) and My Love from the Star (来自星星的你) really made a full success, which even attracted some top officials.

A senior official said he sometimes watched soap operas from South Korea, as well as House of Cards (纸牌屋), an American opera about politics (政治). These operas made both in South Korea and in America have a lot of lovers in China.

Many people agree that China's soap operas can't be much loved by most Chinese, because they are not as interesting and exciting as those operas from South Korea and America, such as My Love from the Star, a Korean love story between a time traveling professor and a famous movie star.

    However,Korean shows not only provide soap operas but also some programmings (综艺节目). Dad, Where Are We Going? is not an original (独创的)Chinese show. We learned it from South Korea although not many in China realize that fact.

Actually, China has a closer culture with South Korea. Shows from this neighbor seem to do better with their exciting stories on the Cinderella theme (灰姑娘主题). Yet they have created many popular shows whose stories tell there's no difference between men and women even though in their country men are certain to play a more important role.