题干

如图所示是世界最大水力发电工程三峡水电站的主体“三峡拦河大坝”,坝顶总长3035米.坝顶高程185米,它筑成可“上窄下宽”的形状,这样做的物理学原因是____;为保证船只正常通航,需修建大型船闸,船闸所应用的物理学原理是____原理.

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液体的压强随深度的增加而增大,连通器

同类题2

阅读理解

(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.