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【多选题】
船舶、航空器和机动车等物权的设立、变更、转让和消灭，如果未经登记，则关于其效力说法错误的有：( )。A.
不得对抗第三人
B.
不得对抗善意第三人
C.
没有法律效力
D.
可以对抗第二人
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A.
Pilots and copilots
B.
Flight attendants
C.
Airline passengers
D.
Baggage handlers
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【判断题】If there are two goods, if a consumer prefers more of each good to less, and if she has diminishing marginal rate of substitution, then her preferences are convex.
A.
正确
B.
错误
【判断题】If there are two goods and the prices of both goods rise, then the budget line must becomes steeper.
A.
正确
B.
错误
【判断题】If there are two goods, if a consumer prefers more of each good to less, and if she has diminishing marginal rate of substitution, then her preferences are convex.
A.
正确
B.
错误
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