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【简答题】
求曲线 在点(1，2)处的切线方程及法线方程．
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反馈参考答案：
举一反三
【判断题】At the end of war, there was a surplus of aircraft which were used for war purposes, which were then converted for leisure purposes to become aircraft to carry passengers rather than munitions.
A.
正确
B.
错误
【单选题】Instead of being playthings, early kites were used for military purposes. Historical records say they were large in size some were powerful enough to carry men up in the air to observe enemy movements...
A.
To make the kites look more pleasant.
B.
To make the kites have strong structures.
C.
To make the kites produce pleasant sounds.
D.
To make the kites fly faster in the wind.
【判断题】At the end of the World War II , there was a surplus of aircraft which were used for war purposes converted to leisure purposes to become aircraft to carry passengers rather than munitions .
A.
正确
B.
错误
【单选题】If you were giving a presentation and your primary goal was to expand your audience’s existing knowledge on a topic, which of the following types of general purposes would you be using?
A.
to inform
B.
to persuade
C.
to manipulate
D.
to entertain
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