题干

下列实验能证明某溶液中含铵根离子的是(  )

A:向溶液中加入石蕊试液后,呈蓝色

B:向溶液中加入酚酞试液后,呈红色

C:将溶液在试管中加热至沸腾,试管口放置的红色石蕊试纸变蓝色

D:将溶液中加入过量烧碱溶液加热至沸腾,试管口放置的红色石蕊试纸变蓝色

上一题 下一题 0.0难度 选择题 更新时间:2012-03-14 05:18:58

答案(点此获取答案解析)

D

同类题3

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(D)

GONE WITH THE WIND

Author:Margaret Mitchell¥25 (in bookstores)¥18 (online)

   Gone With the Wind is a best﹣seller,which tells a story that happened in the American Civil War (美国内战).Scarlett O'Hara is a woman in the story who is full of energy.She is strong and saves her family but is very selfish at the same time.

A LITTLE PRINCESS

Author:Frances Hodgson Burnett¥18.3 (online)

Motherless Sara Crewe was sent home from India to school at Miss Minchin's.Her father was very rich and she lived a rich and comfortable life.Then her father died and Sara lost everything.She had to learn to do with her changed life.Her strong character made her able to fight successfully against her poverty  and the scorn (嘲笑) of her fellows (伙伴).It's an excellent book with 4tapes (磁带) for children.

◆PETER PAN

Author:J.M Barrie

¥15 (in bookstores)¥12 (online)

It is a children's story full of imagination and adventures (冒险),which is aboutWendy,John,and Michael Darling's adventures in Never﹣Never Land with Peter Pan,the boy who would not grow up.The children are happy and lovely.(with 2tapes)

◆UNCLE TOM'S CABIN

Author:Harriet Beecher Stowe¥20 (in bookstores)

The most famous novel in American history,Uncle Tom's Cabin talked about the struggle between free states and slave (奴隶) states during the American Civil War and is as powerful today as when it first came out 150years ago.

•THE SECRET GARDEN

Author:Frances Hodgson Burnett¥35 (in bookstores)¥30 (online)

Mary Lennox,a sickly orphan (孤儿),finds herself in her uncle's dark house.Why are so many rooms locked?Why is one of the gardens locked?And what is that crying she hears at night?Through the power of hope,friendship,and the magic of nature,the brave girl brings the house and a long﹣lost garden back to life.