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Deprecated: think\Collection::sort(): Implicitly marking parameter $callback as nullable is deprecated, the explicit nullable type must be used instead in /www/wwwroot/fangxueba.cn/thinkphp/library/think/Collection.php on line 320 当办公场所和公共场所发现疑似.确诊新冠肺炎病例时，应当停止使用空调通风系统。 - 放学吧
