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【简答题】
企业之所以要承担社会责任是因为( ) A. 权责相符 B. 企业行为的结果 C. 企业是个开放系统 D. 企业是“公民” E. 市场的要求
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举一反三
【单选题】设函数y=f(-x 2 )，则dy等于( )
A.
xf'(-x 2 )dx
B.
-2xf'(-x 2 )dx
C.
2f(-x 2 )dx
D.
2xf'(-x 2 )dx
【简答题】求势函数u(x，y)，使得 (1)du=(3x 2 -3y 2 +4)dx-6xydy (2)du=(e x siny+2xy 2 )dx+(e x cosy+2x 2 y)dy.
【简答题】Passage One Questions 56 to 60 are based on the following passage. Last week I visited one of my old neighborhoods in Washington D.C. I had not been there for twenty years and as I walked along the st...
【简答题】Professor Martin’s report says that children who attend a number of different schools, because their parents have to move around the country, probably make slow progress in their studies. There are al...
【简答题】Passage Two Questions 1 to 5 are based on the following passage. Forgiving is easy. Forgetting the experience that comes before the forgiveness, however, always remains with us. Choosing to forgive me...
【简答题】2xydy=(2y 2 -x)dx．
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