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【单选题】
当系统各元件输入输出特性是线性特性,系统的状态和性能可以用线性微分(或差分)方程来描述时,则称这种系统为( )。A.
线性系统
B.
离散系统
C.
连续系统
D.
非线性控制系统
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皮皮学刷刷变学霸
举一反三
【单选题】The market demand curve
A.
cannot show how quantity demanded changes in response to a change in price.
B.
cannot show a change in demand for a good.
C.
is the horizontal sum of individual demand curves.
D.
is the vertical sum of individual demand curves.
E.
is upward sloping.
【简答题】运输合理化的有效措施有哪些?
【单选题】The market demand is
A.
the sum of all individual demands.
B.
the demand for every product in an industry.
C.
the average quantity demanded at each price.
D.
difficult to determine and is generally an estimation for most markets.
【简答题】市场需求与个人需求(market demand vs．individual demand)
【单选题】The market demand curve is :
A.
derived by vertically summing the individual demand curves at each quantity
B.
derived by horizontally summing the individual demand curves at each price;
C.
derived by vertically summing the individual demand curves at each price
D.
independent of the individual demand curves
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