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【简答题】
验证由二元方程确定的隐函数y=y(x)是否为所给微分方程的解： (1)(x-2y)y'=2x-y， x 2 -xy+y 2 =C； (3)(xy-x)y"+xy' 2 +yy'-2y'=0， y=ln(xy)．
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举一反三
【单选题】In the HO model, the production possibility frontier is bowed out due to the assumption of
A.
identical tastes.
B.
different factor intensities in the production of the two goods.
C.
increasing returns to scale.
D.
Two of the above.
【简答题】( )是高钾血症最主要的原因。
【单选题】The HO model rules out the classical model's basis for trade by assuming that ________ is (are) identical between countries.
A.
factor endowments
B.
factor intensities
C.
technology
D.
opportunity costs
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