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| 紧急报警系统美国联邦通信委员会 (FCC),联邦应急管理局 (FEMA) 和国家气象服务 (NWS) 三个部门建立的当国家处于紧急状况时迅速通告全民的通信方式 (美国) | |||
| 紧急报警系统 | |||
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