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  3. Electronic computer speeds are restricted not only by the speed of electrons in matter but also by the escalating density o

Electronic computer speeds are restricted not only by the speed of electrons in matter but also by the escalating density o

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问题          Electronic computer speeds are restricted not only by the speed of electrons
     in matter but also by the escalating density of interconnections necessary to
     connect the electronic gates on microchips. Electrical engineers and physicists
     have been developing and augmenting the technologies of analog and digital
(5)   optical computing, in which the information is primarily carried by photons
     rather than by electrons. Optical computing could, in principle, generate much
     higher computer speeds, but one of the problems it has encountered lies in
     accuracy, for these devices have practical limits of 8 to 11 bits of accuracy in
     basic operations.  Recent research  has evinced  that digital  partitioning
(10)  algorithms in tandem with error-correction codes, can substantially enhance the
     accuracy of optical computing operations. In the near term optical computers
     will most likely be hybrid optical/electronic systems that preprocess input data
     for computation and post-process output data via electronic circuits, but
     nevertheless, the prospect of all-optical computing remains highly attractive.
选项 A、Researchers have not yet discovered a means of transporting photons more efficiently.
B、Their primary limitation is the density of connections required between electronic microchip gates.
C、Their accuracy level is poor at 8 to 11 bits, but still superior to that Of electronic computers.
D、They invariably rely on electronic circuits to preprocess input data for computation.
E、Both analog and digital forms of optic computing are presently being developed by scientists.
答案E
解析
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