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【单选题】
Why is it not allowed if a person refuses to sell his property to a black man?A.
Because he is not the owner of the property.
B.
Because he has no right to deny another person's equal freedom of choice.
C.
Because the black man is the real owner of the property.
D.
Because it is not permitted by the black man.
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【单选题】When a society achieves allocative efficiency, it
A.
is not achieving production efficiency.
B.
is producing that combination of goods and services that society values most highly.
C.
might or it might not be producing at a point on societyʹs PPF.
D.
is producing a combination of goods and services whose marginal cost exceeds their marginal benefit.
E.
is producing the combination of goods and services for which marginal benefit exceeds marginal cost by as much as possible.
【单选题】Political institutions develop when the complexity of the society reaches the point at which kinship organization can no longer serve as an adequate mechanism for carrying out the political functions ...
A.
The conception of the political institutions.
B.
The difference between conflict and functional theorists.
C.
The different positions the people stand in the racial order.
D.
The development of political institutions.
【单选题】When we see well, we do not think about our eyes very often. (79) It is only when we cannot see perfectly that we realize how important our eyes are. People who are nearsighted can only see things tha...
A.
only when we can see well
B.
only when we cannot see perfectly
C.
even if we can see dell
D.
only when we realize how important our eyes are
【单选题】当一对渐开线齿轮安装时，即使两轮的中心距稍有改变，其传动比仍保持原值不变的原因是_______。
A.
压力角不变
B.
啮合角不变
C.
节圆半径不变
D.
基圆半径不变
【简答题】当一对渐开线齿轮安装时，即使两轮的中心距稍有改变，其角速度比仍保持原值不变的原因是_______。
【简答题】请练习文件的新建、打开、保存、关闭操作,并对操作进行截图或录屏作为回答。
【单选题】When we see well, we do not think about our eyes very often. (76) It is only when we cannot See perfectly that we realize how important our eyes are. People who are near-sighted can only see things th...
A.
only when we can see well
B.
only when we cannot see perfectly
C.
even if we can see well
D.
only when we realize how important our eyes are
【简答题】为了防止烟气温度过高造成排烟风机损坏,在风机入口处要设有当烟气温度 280 度时自动关闭的 阀。
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