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【判断题】
1953年Watson J.D.& Crick F.H.C提出了操纵子模型。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】If a firm moves from one point on a production isoquant to another point on the same isoquant, which of the following will certainly not happen?
A.
A change in the ratio in which the inputs are combined
B.
A change in the marginal products of the inputs
C.
A change in the rate of technical substitution
D.
A change in the level of output
【单选题】If a firm moves from one point on a production isoquant to another point on the same isoquant, which of the following will certainly NOT happen?
A.
a change in the level of output
B.
a change in the ratio in which the inputs are combined
C.
a change in the marginal products of the inputs
D.
a change in the rate of technical substitution
E.
a change in profitability
【单选题】At which labeled point on the action potential is K+ closest to electrochemical equilibrium?
A.
①
B.
②
C.
③
D.
④
E.
⑤
【单选题】An indifference curve is drawn on a graph with good X on the horizontal axis and good Y on the vertical axis. One point on the curve is X = 5, Y = 5. Which of the following points CANNOT also be on ...
A.
X = 6, Y = 6
B.
X = 6, Y = 4
C.
X = 9, Y = 4
D.
X = 2, Y = 11
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