Flyingdevicescalleddrones(無人機)maybeoneofthemostimportan...
問題詳情：Flyingdevicescalleddrones(無人機)maybeoneofthemostimportanttechnologiesofthefuture.Thenumberofjobsforpeoplewhoknowhowtodesign,buildandcontrolthemisincreasing.Becauseofthisincrease,severalU.S.u...