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7.如图,有两根电线杆AB、CD,已知AB=5m,CD=3m,

现在施工人员在两电线杆底端之间(线段BD上)

选一点E,由点E分别向电线杆顶端A、C拉钢索

AE、CE,如果测得∠AEC=90°,且AE=CE,

则BE的长为      米,

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6.如图是跷跷板的示意图,支柱OC与地面垂直,

O是横板AB的中点,AB可以绕着点O上下转动,

A端落地时,∠OAC=20°,则横板AB上下可转动

的最大角度(即∠AOA)是     度 。

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5.计算 =       。

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4.如图正方形的边长为4cm,则图中阴影部分

的面积为    cm2

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3.如图在Rt△ABC中,∠C=90°∠B=30°,AB=2,

  则AC=  

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2.=      。

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1.在实数,   ,  中是      无理数 。

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                      February20th

Notice

Our class, English reading corner have been open for half a year. Everybody says the English books are very helpful to our English studies. In order to make full use of our English corner, please obey the following rules:

Borrow only one book at a time;

Keep the book for only a week and return it on time;

Take good care of the books while reading them.

Thank you. 

Class Committee

英语科

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11.expert  12.thought  13.left  14.dead  15.turned

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6.used  7.teaches  8.hundred  9.upon  10.highly 

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