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【单选题】
行星环绕太阳作椭圆轨道运动，则在运动过程中，行星对太阳中心的A.
角动量守恒，动能也守恒
B.
角动量守恒，动能不守恒
C.
角动量不守恒，动能守恒
D.
角动量不守恒，动量也不守恒
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反馈参考答案：
举一反三
【判断题】If a company in a competitive market persistently pays a discriminatory wage to a certain group, it must be because the employer is a bigot.
A.
正确
B.
错误
【单选题】Beginning from a long run equilibrium in a competitive industry, if there is a substantial, permanent increase in demand for industry output:
A.
firms will enter the industry, the quantity produced will rise, and prices will end up lower than their initial long run equilibrium level.
B.
firms will enter the industry, the quantity produced will rise, and prices will end up higher than their initial long run equilibrium level.
C.
firms will enter the industry, the quantity produced will rise, and prices will end up at the same level as their initial long run equilibrium level.
D.
firms will enter the industry, the quantity produced will rise, and but without more information, we cannot know if prices will end up higher than their initial long run equilibrium level.
【单选题】If a seller in a competitive market chooses to charge more than the market price, then
A.
buyers would tend to buy more from this seller.
B.
the owners of the raw materials used in production would raise the prices for the raw materials.
C.
other sellers would also raise their price.
D.
buyers will tend to make purchases from other sellers.
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