數學考試...當你算完時發現這樣真的很幹
The air force men who fly drones in Afghanistan by remote control - TelegraphBefore 9/11, drones were a new, untried technology. Now it is estimated that 40 countries are trying to buy or develop unmanned aircraft. The United States operates 7,500 drones or, in the official parlance, Unmanned Aerial Vehicles (UAVs), making up more...
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