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【简答题】
单子叶植物茎的维管束为（），裸子植物和双子叶植物茎的维管束为（）。单子叶植物根和双子叶植物根初生构造的维管束为（）。
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举一反三
【单选题】If short-run equilibrium in the Mundell-Fleming model is represented by a graph with Y along the horizontal axis and the exchange rate along the vertical axis, then the LM* curve:
A.
slopes upward and to the right because at a higher income a higher interest rate is needed to increase velocity.
B.
is vertical because monetary velocity is independent of the interest rate.
C.
is vertical because the exchange rate does not enter into the LM * equation.
D.
slopes upward and to the right because a higher exchange rate leads to a higher income.
【单选题】Although Milton Friedman does not hold that velocity is a constant, he does conclude that
A.
the money supply is the primary determinant of nominal income.
B.
changes in velocity will be highly predictable.
C.
changes in velocity are not predictable.
D.
both (a) and (b) of the above are correct.
【单选题】某吸收过程,已知气膜吸收系数 k Y 为 4 × 10 -4 kmol/(m 2 × S ), 液膜吸收系数 k x 为 8 kmol/(m 2 × S ), 由此可判断该过程( )
A.
气膜控制
B.
液膜控制
C.
判断依据不足
D.
双膜控制
【单选题】A country's domestic policies ______.
A.
can not be forcibly changed by the U.N.
B.
are often investigated by the U.N.
C.
are often enforced by the U.N.
D.
are not allowed to benefit from U.N. advice or assistance
【单选题】某吸收过程,已知气膜吸收系数k Y 为4×10 -4 kmol/(m 2 •s),液膜吸收系数k X 为8kmol/(m 2 •s),由此可判断该过程为( )。
A.
气膜控制
B.
液膜控制
C.
判断依据不足
D.
双膜控制
【单选题】If the money supply is $600 and nominal income is $3,000, the velocity of money is
A.
1/50.
B.
1/5.
C.
5.
D.
50.
【简答题】假定βX1的真实值为0．4，则估计值是否有偏?为什么?
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