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在计算机网络中，按网络的作用范围进行分类可以将网络分为三类，分别是（）、（）和（）

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互联网Internet采用的体系结构是（）

TCP/IP体系结构分为4层结构，从下到上分别是网络接口层、（）、（）和（）

OSI模型是Internet理论上的体系结构，从下到上可分为物理层、（）、（）、（）、会话层、表示层和应用层七个层次

[音频]We cannot travel every path. Success must be won along one line. We must make our business the one life purpose to which every other must be _______. I hate a thing done by halves. If it be right, do it boldly. If it be wrong, leave it undone. The men of history were not perpetually looking into the mirror to make sure of their own size. _ in their work they did it.They did it so well that the wondering world sees them to be great, and them accordingly. To live with a high ideal is a successful life. It is not what one does, but what one tries to do, that makes a man strong. “Eternal vigilance,” it has been said, “is the price of .” With equal truth it may be said, “Unceasing effort is the price of success.”If we do not work with our might, others will; and they will outstrip us in the race, and pluck the prize from our grasp. Success grows less and less _ on luck and chance. Self-distrust is the cause of most of our failures. The great and ___ help to success is character. Character is a crystallized habit, the result of training and conviction.Every character is influenced by heredity, environment and education. But these apart, if every man were not to be a great extent the _ of his own character, he would be a fatalist, and __ creature of circumstances. Instead of saying that man is a creature of circumstance, it would be nearer the mark to say that man is the architect of circumstance.From the same materials one man builds , another hovel. Bricks and mortar are mortar and bricks, until the architect can make them something else. The true way to gain much is never to to gain too much. Wise men don’t care for what they can’t have.