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【简答题】
求下列微分方程的通解： (4)(x-2xy-y 2 )y'+y 2 =0．
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反馈参考答案：
举一反三
【简答题】水文现象具有时程变化的( )与( )的对立统一,地区分布的( )与( )的对立统一。
【单选题】Which one of the following will drastically affect the performance of the insulation material, if the cable is exposed to?
A.
Weather
B.
Oil
C.
Chemicals
D.
All of the above
【简答题】什么是飞行错觉?它有何特点?
【判断题】The structure of a material depends on how it is processed, and a material's performance is a function of its properties.
A.
正确
B.
错误
【判断题】High yield strength is beneficial to material cold forming and welding performance improvement.
A.
正确
B.
错误
【单选题】Which material has the best casting performance ?
A.
White cast iron
B.
Gray cast iron
C.
Aluminum alloys
D.
Magnesium alloys
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