题目内容
客户端初始化一个Socket后需要启动线路侦听（listen）才能知道是否可以连接服务器端。
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[音频]Many college students today own personal computers that cost anywhere from $1,000 to perhaps $5,000 or more. (1)_________,it is not uncommon for them to purchase (2)_________costing another several hundred dollars. Twenty years ago, computers were (3) ________, but they were very large and extremely expensive. Few, if any,(4) __________ purchased computers for home use. Over the years, the price of the “guts” of a computer---its memory—has declined to less than a thousandth of the price per unit of memory that prevailed twenty years ago. This is the main reason why computers cost so much less today than they used to. Moreover, (5) ________ improvements have made it possible to (6)__________ memory circuitry(储存器电路)that is small enough to fit intothe portable personal computers that many of us own and use. (7)___________, as the price of computation has declined the average consumer and business have spent more on purchasing computers.(8)___________,improved agricultural technology, hybrid(杂交) seeds,(9)_________animal breeding, and so on have vastly increased the amount of output a typical farmer can produce. The prices of goods such as meats and grains have fallen sharply relative to the prices of most other goods and services. As agricultural prices have fallen, many households have decreased their total expenses on food. Even though the (10)______________of a product purchased generally increases when its price falls, total expenses on it may decline.
十进制数62对应的十六进制数是
相邻两组编码只有一位不同的编码是
下列几种说法中与BCD码的性质不符的是
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