电路交换的数据网的局间信令完成本地、长途和国际的电话和非话的各种接续。()
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WhenIcamethroughthecustomsattheairport,Ihadtopay________onaclockIhadbought.
Wooddoesnotconductelectricity;________.
Wemust______thattheexperimentiscontrolledasrigidlyaspossible.
党在过渡时期的总路线和总任务是______。
Hethoroughlyunderstoodthesociety__________.
