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【Ex.5】将下列词填入适当的位置(每词只用一次) speed device other considered exists hardware effective operate moving designer A buffer is a data area shared by__(1)__ devices or program processes that __(2)__ at different speeds or with different sets of priorities. The buffer allows each __(3)__ or process to operate without being held up by the__(4)__. In order for a buffer to be__(5)__, the size of the buffer and the algorithms for__(6)__ data into and out of the buffer need to be __(7)__by the buffer__(8)__. Like a cache, a buffer is a "midpoint holding place" but__(9)__ not so much to accelerate the__(10)__ of an activity as to support the coordination of separate activities.
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【简答题】A． children should visit their parents from time to time. B．Parents should support their children when they are in trouble. C．Children should leave their parents when they are grown up. D．P...
【单选题】What is the way that the computer viruses infect the computer systems?
A.
They invade the computer and make it a place for manufacturing.
B.
They spread throughout the whole system by quickly copying themselves.
C.
They infect the hard disc and the whole system.
D.
They spread viruses inside the computer system.
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