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【判断题】
以一条平面曲线绕其平面上的一条直线旋转一的曲面称为旋转曲面,这条定直线叫旋转曲面的轴.A.
正确
B.
错误
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举一反三
【简答题】Early one morning, more than a hundred years ago, an American inventor called Elias Howe finally fell asleep. He had been working all night on the design of a sewing machine but he had run into a very...
【简答题】Early one morning, more than a hundred years ago, an American inventor called Elias Howe finally fell asleep. He had been working all night on the design of a sewing machine but he had run into a very...
【单选题】The manager forced him ____ more though he was tired.
A.
do
B.
doing
C.
done
D.
to do
【简答题】Early one morning, more than a hundred years ago, an American inventor called Elias Howe finally fell asleep. He had been working all night on the design of a sewing machine but he had run into a very...
【简答题】Early one morning, more than a hundred years ago, an American inventor called Elias Howe finally fell asleep. He had been working all night on the design of a sewing machine but he had run into a very...
【简答题】Early one morning, more than a hundred years ago, an American inventor called Elias Howe finally fell asleep. He had been working all night on the design of a sewing machine but he had run into a very...
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