题目内容
The ________ ________ ________ is an architectural framework for accessing linked documents spread out over thousands of machines all over the Internet.
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The file transfer protocol allows you to download files for free from thousands of computers around the world.
In general, the amount that a student spends for housing should be held to one-fifth the totalfor living expense.
1.3.2无穷大是无界量，无界量也一定是无穷大。
1.3.1无穷大的倒数是无穷小，无穷小的倒数是无穷大。
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