建设工程施工招标文件发出后,招标人不得擅自变更其内容。确需进行必要的澄清、修改或补充的,应当在招标文件要求提交投标文件截止时间至少( )天前,书面通知所有获得招标文件的投标人。
Goods are carried by several of transport--on road or rail, by sea or air.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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