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【单选题】
视网膜层哪层细胞之间粘连松驰,易发生网脱( )A.
色素上皮细胞与细胞之间
B.
色素上皮细胞与锥、杆细胞之间
C.
细胞与视神经节细胞之间
D.
锥杆状细胞之间
E.
以上均不是
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【单选题】以下哪些因素会影响驾驶舱交流的顺利进行
A.
公司的营运政策、公司企业文化以及态度
B.
飞行技术的好坏、机载设备以及气象条件
C.
过于自信、过强的依赖心以及过强的权力欲
【简答题】补写出下列横线处的上句或下句 翠叶藏莺,朱帘隔燕,( _____ )。(晏殊《踏莎行》)
【单选题】During November 2012, gasoline prices were falling, which made travel by car less expensive, but air fares remained as high as ever. If income is unchanged and air travel is a normal good, _________.
A.
the substitution effect is an increase in car travel and the income effect is a decrease in car travel
B.
both the substitution and income effects decrease car travel
C.
the substitution effect is an increase in car travel and there is no income effect on car travel
D.
both the substitution and income effects increase car travel
【单选题】Which of the following s could shift the demand curve for gasoline to the left?
A.
The income of gasoline buyers rises, and gasoline is a normal good.
B.
The income of gasoline buyers falls, and gasoline is an inferior good.
C.
Public service announcements run on television encourage people to walk or ride bicycles instead of driving cars.
D.
The price of gasoline rises.
【单选题】Gasoline is a normal good. If the price of gasoline falls, a consumer buys more gasoline because of
A.
only an income effect.
B.
only a substitution effect.
C.
an increase in the marginal rate of substitution.
D.
both an income effect and a substitution effect.
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