袋装水泥的取样应以同一水泥厂、同期到达、同品种、同标号的不超过( )吨为一个取样单位,随机从( )个以上不同部位的袋中取等样品水泥经混拌均匀后称取不少于( )kg。( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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