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【单选题】
在双缝干涉实验中,入射光的波长为λ,用玻璃片遮住双缝中的一个缝,若玻璃 片 中光程比相同厚度的空气的光程大 2.5 λ ,则屏上原来的A.
仍为明条纹
B.
变为暗条纹
C.
既非明纹也非暗纹
D.
无法确定是还是暗纹
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皮皮学刷刷变学霸
举一反三
【单选题】Economies of scale are:
A.
unit cost increases associated with learning effects.
B.
unit cost reductions due to inferior quality of products.
C.
realized when output is reduced to a minimum.
D.
realized when the selling price is equal to the cost price of the products.
E.
unit cost reductions associated with a large-scale output.
【简答题】应交税费
【简答题】应交税金和应交税费的区别?
【单选题】Which of the following is not an advantage of printed music?
A.
Reading music notation has a great impact on musicians.
B.
People may draw inspiration from it.
C.
The music culture will be influenced by it in the end.
D.
Songs tend to be standardized by it.
【单选题】The existence of internal economies of scale
A.
cannot be associated with a perfectly competitive industry.
B.
may be associated with a perfectly competitive industry.
C.
is associated only with sophisticated products such as aircraft.
D.
cannot form the basis for international trade.
E.
focuses more on the industry than individual firms.
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