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【单选题】
PNP型和NPN型晶体管，其发射集电区均为同类型半导体（N型或P型）。所以在实际使用中发射极与集电极（ ）。
A.
可以调换使用
B.
不可以调换使用
C.
PNP 型可以调换使用， NPN 型则不可以调换使用
D.
NP N 型可以调换使用， PN P 型则不可以调换使用
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【单选题】Table 3-2Assume that Aruba and Iceland can switch between producing coolers and producing radios at a constant rate.Labor HoursNeeded to Make 1CoolerRadioAruba25Iceland1423. Refer to Table 3-2. Assume...
A.
a
B.
b
C.
c
D.
d
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【判断题】由于壳式铁芯结构比较简单,绕组的布置和绝缘也比较容易,因此我国电力变压器主要采用壳式铁芯,只在一些特种变压器(如电炉变压器)中才采用心式铁芯。()
A.
正确
B.
错误
查看完整题目与答案
【判断题】Suppose that two countries are exactly alike in every respect except that the citizens of country A have a higher saving rate than the citizens of country B, then in the steady state country A will ha...
A.
正确
B.
错误
查看完整题目与答案
【单选题】Total output in an economy increases when each person specializes because
A.
there is less competition for the same resources.
B.
each person spends more time producing that   product in which he or she has a comparative advantage.
C.
a wider variety of products will be produced   within each country due to specialization.
D.
government necessarily plays a larger role in the   economy due to specialization.
查看完整题目与答案
【单选题】由于()铁芯结构比较简单，绕组的布置和绝缘也比较容易，因此被我国电力变压器主要采用。
A.
圆式
B.
壳式
C.
心式
D.
球式
查看完整题目与答案
【单选题】Economic Growth The economy of a nation requires (46) . Total output must grow if the country is to absorb about 1.5 million new workers who enter the labor force each year and more workers who are re...
A.
unemployment rose
B.
they were unable to find work
C.
a healthy rate of economic growth
D.
out of work
E.
they must increase real gross domestic product (GDP) continuously
F.
higher unemployment and limited gains in per-capita output and income (46)
查看完整题目与答案
【多选题】现代教育技术区别于传统以电声媒体和投影媒体为代表的教育技术的是:
A.
. 现代教育理论的指导
B.
研究范畴更加广泛
C.
. 研究对象发生改变
D.
现代信息技术的应用
查看完整题目与答案
【多选题】现代教育技术区别于传统以电声媒体和投影媒体为代表的教育技术的是:(多选)
A.
现代教育理论的指导
B.
研究范畴更加广泛
C.
研究对象发生改变
D.
现代信息技术的应用
查看完整题目与答案
【单选题】If trade corresponds to the Heckscher-Ohlin theory, w hich of the following is most likely to happen in the long run after a labor-abundant country engages in free trade ? a. The rate of unemployment ...
A.
B.
C.
D.
D
查看完整题目与答案
【多选题】关于403机房6200设备网络拓扑结构说法错误的是( )
A.
一共三台6200设备，组成环网
B.
环网速率为10GE
C.
6200-1的gei_1/1口与6200-2的gei_1/1相连接
D.
6200-2的gei_1/2口与6200-3的gei_1/1相连接
查看完整题目与答案
相关题目：
【单选题】Table 3-2Assume that Aruba and Iceland can switch between producing coolers and producing radios at a constant rate.Labor HoursNeeded to Make 1CoolerRadioAruba25Iceland1423. Refer to Table 3-2. Assume...
A.
a
B.
b
C.
c
D.
d
查看完整题目与答案
【判断题】由于壳式铁芯结构比较简单,绕组的布置和绝缘也比较容易,因此我国电力变压器主要采用壳式铁芯,只在一些特种变压器(如电炉变压器)中才采用心式铁芯。()
A.
正确
B.
错误
查看完整题目与答案
【判断题】Suppose that two countries are exactly alike in every respect except that the citizens of country A have a higher saving rate than the citizens of country B, then in the steady state country A will ha...
A.
正确
B.
错误
查看完整题目与答案
【单选题】Total output in an economy increases when each person specializes because
A.
there is less competition for the same resources.
B.
each person spends more time producing that   product in which he or she has a comparative advantage.
C.
a wider variety of products will be produced   within each country due to specialization.
D.
government necessarily plays a larger role in the   economy due to specialization.
查看完整题目与答案
【单选题】由于()铁芯结构比较简单，绕组的布置和绝缘也比较容易，因此被我国电力变压器主要采用。
A.
圆式
B.
壳式
C.
心式
D.
球式
查看完整题目与答案
【单选题】Economic Growth The economy of a nation requires (46) . Total output must grow if the country is to absorb about 1.5 million new workers who enter the labor force each year and more workers who are re...
A.
unemployment rose
B.
they were unable to find work
C.
a healthy rate of economic growth
D.
out of work
E.
they must increase real gross domestic product (GDP) continuously
F.
higher unemployment and limited gains in per-capita output and income (46)
查看完整题目与答案
【多选题】现代教育技术区别于传统以电声媒体和投影媒体为代表的教育技术的是:
A.
. 现代教育理论的指导
B.
研究范畴更加广泛
C.
. 研究对象发生改变
D.
现代信息技术的应用
查看完整题目与答案
【多选题】现代教育技术区别于传统以电声媒体和投影媒体为代表的教育技术的是:(多选)
A.
现代教育理论的指导
B.
研究范畴更加广泛
C.
研究对象发生改变
D.
现代信息技术的应用
查看完整题目与答案
【单选题】If trade corresponds to the Heckscher-Ohlin theory, w hich of the following is most likely to happen in the long run after a labor-abundant country engages in free trade ? a. The rate of unemployment ...
A.
B.
C.
D.
D
查看完整题目与答案
【多选题】关于403机房6200设备网络拓扑结构说法错误的是( )
A.
一共三台6200设备，组成环网
B.
环网速率为10GE
C.
6200-1的gei_1/1口与6200-2的gei_1/1相连接
D.
6200-2的gei_1/2口与6200-3的gei_1/1相连接
查看完整题目与答案
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