一道简单的理论力学题
图中杆AD受力应该是什么样的?
是否属于二力杆?滚动支座给A的力不是应该向上吗?
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一道奥数题,图中大圆的面积是120.那么,阴影部分面积是( ).
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精彩回答
The number of books in the bookshop ______ (be) about 10,000 and most of them are about science.
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The mother didn't know___________ is to blame for the broken glass as it happened while she was out.
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This is the magazine _______ I copied the paragraph.
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During the summer holidays there will be a new schedule .
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