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【单选题】
Who is it that ultimately determines the demand for a product or service?A.
those who buy the product or service.
B.
the government
C.
the producers who create the product or service.
D.
those who supply the raw materials used in the production of the good or service.
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反馈参考答案：
举一反三
【判断题】串级调速就是利用一个或n个辅助电机或者电子设备串联在绕线式异步电动机转子回路里,把原来损失在外串电阻的那部分能量加以利用,或者回收到电网里,既能达到调速的目的,又能提高电动机运行效率,这种调速方法叫做串级调速。
A.
正确
B.
错误
【单选题】The table given below shows the number of umbrellas and bushels of corn produced in the United Kingdom and the Rest of the World per labor hour. If the U.K. and the Rest of the World begin to trade wi...
A.
2/3 of an umbrella per bushel of corn; 3 umbrellas per bushel of corn
B.
2/3 of an umbrella per bushel of corn; 3/2 umbrellas per bushel of corn
C.
1/2 of an umbrella per bushel of corn; 3/2 of an umbrella per bushel of corn
D.
3/2 umbrellas per bushel of corn; 3 umbrellas per bushel of corn
【单选题】The table given below shows the number of umbrellas and bushels of corn produced in the United Kingdom and the Rest of the World per labor hour. The opportunity cost of producing a bushel of corn in t...
A.
2/3 of an umbrella
B.
3 umbrellas
C.
1/2 of an umbrella
D.
2 umbrellas
【简答题】Those are our umbrellas. Give ______ our umbrellas please.
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