按现行《1:5001:10001:2000地形图航空摄影测量数字化测图规范》,一幅图宜采用一种基本等高距,当用基本等高距不能描述地貌特征时,应加绘()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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