解放军某部有600人,他们排成四路纵队,每相邻两排之间前后相距1米,队伍每分钟行75米,现在要通过一座长676米的桥,从排头上桥到排尾离桥需多少分钟?( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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