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成本函数是用数学公式表示的企业成本与 之间的关系。
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企业推出一种新的产品，采用取脂定价策略和渗透定价策略的主要差别是 。
我国电信企业经常开展“打电话累计积分并根据积分给与奖励”的活动，这在资贤定价策略国属于 。
企业最基本的经济活动是 。
Picture-taking is a technique both for reflecting the objective world and for expressing the singular self. Photographs depict objective realities that already exist, though only the camera can disclose them. And they depict an individual photographer"s temperament, discovering itself through the camera"s cropping of reality. That is, photography has two directly opposite ideals, in the first, photography is about the world and the photographer is a mere observer who counts for little; but in the second, photography is the instrument of fearlessness, questing subjectivity and the photographer is all. These conflicting ideals arise from uneasiness on the part of both photographers and viewers of photographs toward the aggressive component in "taking" a picture. Accordingly, the ideal of a photographer as observer is attracting because it implicitly denies that picturetaking is an aggressive act. The issue, of course, is not so clear-cut. What photographers do cannot be characterized as simply predatory or as simply, and essentially, benevolent. As a consequence, one ideal of picture-taking or the other is always being rediscovered and championed. An important result of the coexistence of these two ideals is a recurrent ambivalence toward photography"s means. Whatever are the claims that photography might make to be a form of personal expression just like painting, its originality is closely linked to the power of a machine. The steady growth of these powers has made possible the extraordinary informativeness and imaginative formal beauty of many photographs, like Harold Edgerton"s high-speed photographs of a bullet hitting its target or of the swirls and eddies of a tennis stroke. But as cameras become more sophisticated, more automated, some photographers are tempted to disarm themselves or to suggest that they are not really armed, preferring to submit themselves to the limit imposed by pre-modern camera technology because a cruder, less high-powered machine is thought to give more interesting or emotive results, to leave more room for creative accident. For example, it has been virtually a point of honor for many photographers, including Walker Evans and Cartier Bresson, to refuse to use modern equipment. These photographers have come to doubt the value of the camera as an instrument of "fast seeing". Cartier Bresson, in fact, claims that the modern camera may see too fast. This ambivalence toward photographic means determines trends in taste. The cult of the future (of faster and faster seeing) alternates over time with the wish to return to a purer past when images had a handmade quality. This longing for some primitive state of the photographic enterprise is currently widespread and underlies the present-day enthusiasm for daguerreotypes and the work of forgotten nineteenth-century provincial photographers. Photographers and viewers of photographs, it seems, need periodically to resist their own knowingness.Notes:crop vt. 播种,修剪(树木)收割count for little 无关紧要predatory 掠夺成性的champion n. 冠军；vt.支持benevolent 好心肠的ambivalence 矛盾心理make (+不定式) 似乎要: He makes to begin.(他似乎要开始了)swirls and eddies 漩涡cult 狂热崇拜daguerreotypes (初期的)银板照相法 The two directly opposite ideals of photography differ primarily in the
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