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【单选题】
A jeweler cut prices in his store by 20%. As a result:A.
Its total revenue would fall by 20% if the elasticity of demand was zero.
B.
Its total revenue would fall, but by less than 20% if the elasticity of demand is greater than zero but less than one.
C.
Its total revenue would rise if the elasticity of demand is greater than one.
D.
All of the above would be true.
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【简答题】若三相异步电动机在额定电压下起动，其起动电流是额定运行时的5倍，是否起动时电磁转矩也为额定电磁转矩的5倍?为什么?
【单选题】单萜的代表式是( )
A.
(C 5 H 8 ) 2
B.
C 5 H 8
C.
(C 5 H 8 ) 4
D.
(C 5 H 8 ) 6
E.
(C 5 H 8 ) 3
【单选题】三相异步电动机在额定电压下运行时,若负载转矩略微增加,则
A.
转速升高,转子电流减小
B.
转速升高,转子电流增大
C.
转速降低,转子电流减小
D.
转速降低,转子电流增大
【简答题】My grandma felt happy each time I visited her.
【简答题】一台三相异步电动机在额定情况下运行时，若电源电压突然下降，而负载转矩不变，试分析下述各量有无变化?为什么? 磁场的转速n0；
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