URL是Internet中资源的命名机制,URL由三部分构成( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
Programs for Web site design and HTML coding are called Web page editors or .
Internet上最重要的信息资源是Web网页,浏览网页最常用的软件是_______。
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