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【单选题】
在64位计算机中,一个字长所占字节数为( )A.
64
B.
8
C.
4
D.
1
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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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