单项选择题
Digital photography is still new enough that most of us have yet to form.an opinion about it【1】develop a point of view.But this hasn’t stopped many film and computer fans from agreeing【2】the early conventional wisdom about digital cameras —they’re neat【3】for your PC,but they’re not suitable for everyday picture taking.
The fans are wrong.More than anything else,digital cameras are radically【4】what photography means and what it can be.The venerable medium of photography【5】we know,it is beginning to seem out of【6】with the way we live.In our computer and camcorder【7】,saving pictures as digital【8】and watching them on TV is no less practical —and in many ways more【9】than fumbling with rolls of film that must be sent off to be【10】.
Paper is also terribly【11】.Pictures that are incorrectly framed,【12】,or lighted are nonetheless committed to film and ultimately processed into prints.
The digital medium changes the【13】.Still images that are【14】digitally can immediately be shown on a computer【15】,a TV screen,or a small liquid crystal display (LCD)built right into the camera.And since the points of light that【16】an image are saved as a series of digital bits in electronic memory,【17】being permanently etched onto film,they can be erased,retouched,and transmitted【18】.
What’s it like to【19】with one of these digital cameras?It’s a little like a first date —exciting,confusing and fraught with【20】.
(1)()
A.rather than
B.let alone
C.much less
D.so as to
相关考题
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未知题型
碳在γ-Fe中扩散,D0=2.0×10-1cm2/s,Q=140×103J/mol,求碳在γ-Fe中927℃时的扩散系数,并计算为了得到与927℃渗碳10h相同的结果,在870℃渗碳需要多长时间?
A.0×10-1cm2/s,Q=140×103J/mol,求碳在γ-Fe中927℃时的扩散系数,并计算为了得到与927℃渗碳10h相同的结果,在870℃渗碳需要多长时间?
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单项选择题
Which one of the following is NOT true about Matthew Connelly?()
A.He is the youngest of 8 children in the family and grew up to be an historian.
B.He is expected to address the population problem from a different perspective.
C.His personal experience of large families is the reason why he wants to do research in population.
D.He wants to dedicate his research to his parents. -
问答题
一块碳质量分数wC=0.1%的碳钢在930℃渗碳,在距表面0.05cm处碳含量达到wC=0.45%。在t>0的全部时间,渗碳气氛保持表面成分为wC=1%,假设DCγ=2.0×10-5exp(一140000/RT),求:①渗碳时间;②若将渗层加深一倍需要多长时间;③若规定wC=0.3%作为渗碳层厚度的度量,那么在930℃渗碳10h的渗层厚度为870℃渗碳10h的多少倍?
