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【单选题】
“The critical thinking class taught by Professor Smith covers inductive reasoning. Therefore, the critical thinking class taught by Professor Jones will too.” What are the analogues?A.
Critical thinking and inductive reasoning
B.
Professor Jones and Professor Smith
C.
Jones’s course and Smith’s course
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【简答题】一台三相同步电动机的数据如下：额定功率P N =2000kW，额定电压U N =3000V(星形联结)，额定功率因数cosφ N =0.9(超前)，额定效率η N =80%，同步电抗X s =1.5Ω，忽略定子电阻。当电动机的电流为额定值，cosφ=1时，励磁电流为5A。如功率改变，电流变为0.9I N ，cosφ=0.8(超前)，求此时的励磁电流(设空载特性为一直线)。
【单选题】A main advantage of specialization results from:
A.
Economies of large-scale production
B.
The specializing country behaving as a monopoly
C.
Smaller production runs resulting in lower unit costs
D.
High wages paid to foreign workers
【简答题】Imperfect
competition results from ______.A. monopoly in government policies B. monopoly in natural resources C. differentiated products D. t he advantages of increasing returns
of economics of scale.
【单选题】Consider Figure 5.3. Assume that Swedish import companies behave as a monopoly buyer while foreign export companies behave as competitive sellers. Compared to free trade, Sweden's import quota results...
A.
Gains totaling $1.60
B.
Gains totaling $3.20
C.
Losses totaling $1.60
D.
Losses totaling $3.20
【简答题】一台三相同步电动机的数据如下：额定功率PN=2000 kW，额定电压UN=3000 V(星形连接)，额定功率因数cosφN=0．9(超前)，额定效率ηN=80％，同步电抗Xt=1.5Ω，忽略定子电阻。当电动机的电流为额定值，cosφ=1时，励磁电流为5 A。如功率改变，电流变为0．9INcosφ=0．8(超前)，求此时的励磁电流(设空载特性为一直线)。
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