The success or failure of a product seems to be determined by a number of factors, one of which, the author emphasizes, is the consumer's perception of the product's______
A.
quality and price
B.
usefulness and durability
C.
need satisfying capability
D.
appearance and inner packing
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举一反三
【单选题】Injectors for use with heavy fuel oil must be cooled by either water or light oil to_____.
【简答题】The supply of oil can he shut off unexpectedly at any time, and in any case, the oil wells will all run dry in thirty years or so at the present rate of use. ___________________________________