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来源：雅诚德英语网
Is there an established procedure to conduct unannounced security checks periodically for all areas of concern?
是否有相关制度，对所有重点区域是否定期进行突击安全检查？
Is there an established procedure to conduct unannounced security checks periodically for all areas of concern?
是否有相关制度，对所有重点区域是否定期进行突击安全检查？