从正方形的铁片上,截去2cm宽的一个矩形,余下的矩形面积是48cm2,求原来的正

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问题:

从正方形的铁片上,截去2cm宽的一个矩形,余下的矩形面积是48cm2,求原来的正方形铁片的边长.

考点:一元二次方程的应用
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下面哪项最符合电子文件载体保护的环境要求?()

A、温度:17℃~20℃、相对湿度:35%~45%

B、温度:17℃~30℃、相对湿度:45%~55%

C、温度:10℃~30℃、相对湿度:35%~65%

D、温度:17℃~20℃、相对湿度:25%~35%

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In the dining room of my grandfather’ s house stood his heavy clock. Meals in the dining room were a (21) for our four generations to become one. My grandfather’ s clock always stood like a trusted old family friend, (22) us playing jokes and tellingstories, which was already a (23) of our life.

When I was a child, the old clock interested me. I watched and listened to it during (24) I was surprised how at (25) times of the day, the clock would strike three times, six times or more, with a wonderful great (26) that echoed throughout the house. The clock chimed year after year, a part of my (27) , a part of my heart.

Even more (28) to me was my grandfather’s special action each day. He meticulously (29) the clock with a special key each day. The key was magic to me. It (30) our family’ s magnificent clock ticking and striking all year round.

25()

A.time 

B.possibility 

C.problem 

D.pleasure

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早期矽肺患者,肺功能改变程度与X线胸片表现严重程度()

A.一定一致

B.不一定一致

C.前者重于后者

D.后者重于前者

E.两者毫无关系

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超声发现胎儿心脏的活动,最早在妊娠第几周()。

A.4~5周

B.6~周

C.8~9周

D.10~12周

E.14~16周

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如何区别癫证与狂证?

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