皮皮学，免费搜题
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【单选题】
V-M 转速负反馈调速系统中 ,下列 参数发生变化时,系统无调节作用A.
电网电压
B.
负载转矩
C.
电枢电阻
D.
给定电压
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反馈参考答案：
举一反三
【简答题】When supply exceeds demand for any product, prices are ________ to fall. A) timely B) simultaneous C) subject D) liable
【单选题】Excess supply occurs when:
A.
. the price is above the equilibrium price.
B.
. the quantity demanded exceeds the quantity supplied.
C.
. the price is below the equilibrium price.
D.
. the quantity demanded exceeds the quantity supplied and when the price is below the equilibrium price.
【单选题】Which of the following statements is not valid when the market supply curve is vertical?
A.
Market quantity supplied does not change when the price changes.
B.
Supply is perfectly inelastic.
C.
An increase in market demand will increase the equilibrium quantity.
D.
An increase in market demand will increase the equilibrium price.
【单选题】When the demand for facial tissues increased, the supply ______.
A.
was not stopped
B.
became more competitive
C.
remained unchanged
D.
was increased to keep up with the demand
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