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问题 单项选择题

混凝土悬臂构件底模拆除时，混凝土强度至少不得低于设计强度的（ ）%

A．50

B．75

C．90

D．100

答案

参考答案：D

解析：【解析】混凝土悬臂梁构件底模拆除时，混凝土强度不低于设计强度的100%。故选D。

填空题

根据短文内容及首字母提示，填写所缺单词，使短文意思完整。

       Next Friday is Christmas. At this time of the year people usually (1)s            for presents for their families

and friends. They also (2)b            food, greeting cards and Christmas trees before Chritmas. People sing and

(3)d            day and night. And they (4)e            all kinds of food. Many families have Christmas (5)t           .

People decorate them (6)w            coloured lights (彩灯). There are also many (7)p            in the trees. Parents

also put presents in children's stockings (长筒袜). In many places, people think Father Christmas (8)b            

presents to children. He is a fat man in red (9)c           . There is a big (10)b            on his back. In it there are

a lot of presents.

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解答题

25平方米和25米一样大______．
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