18. 注册会计师拟从编号为1~200的凭证中抽取20张进行审计,假定以017号凭证为随机起点,采用系统抽样法顺序抽取的第四个样本的凭证号为( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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