已知EXCEL某工作中的D1单元格等于1,D2单元格等于2,D3单元格等于3,D4单元格等于4,D5单元格等于5,D6单元格等于6,则sum(D1:D3,D6)的结果是()。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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