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【单选题】
镜头光圈的大小用F值表示,其定义是________。A.
镜头的有效孔径的的直径/镜头的焦距
B.
镜头的有效孔径的直径
C.
镜头的焦距/镜头的有效孔径的直径
D.
镜头的焦距
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参考解析：
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皮皮学刷刷变学霸
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【单选题】Table 1 Year Peaches Pecans 2005 $11 per bushel $6 per bushel 2006 $9 per bushel $10 per bushel Refer to Table 1 . Suppose the typical consumer basket consists of 10 bushels of peaches and 15 bushels ...
A.
100.
B.
120.
C.
200.
D.
240.
【单选题】QuantityTotal Revenue0$01$152$303$454$60Refer to Table 6-1. For a firm operating in a competitive market, the price is
A.
$45.
B.
$30.
C.
$15.
D.
$0.
【单选题】Production Possibilities for LibrarylandBooksMagazines40003002002003501004500500Refer to Table 1-6. What is the opportunity cost to Libraryland of increasing the production of books from 200 to 300?
A.
100 magazines
B.
150 magazines
C.
200 magazines
D.
350 magazines
【单选题】QuantityTotal Revenue0$01$152$303$454$60Refer to Table 6-1. For a firm operating in a competitive market, the marginal revenue is
A.
$45.
B.
$30.
C.
$15.
D.
$0.
【单选题】QuantityTotal Revenue0$01$152$303$454$60Refer to Table 6-1. For a firm operating in a competitive market, the average revenue is
A.
$45.
B.
$30.
C.
$15.
D.
$0.
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