在网页中通常会碰到诸如“给我写信”,“有问题请联系XXX”,鼠标点击就会自动打开OUTLOOK软件,弹出“新建邮件”的程序窗口。这种超级链接类型是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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