介绍无人机的英语作文100字
President Barack Obama has confirmed the US is using unmanned aircraft to target suspected militants in tribal areas of Pakistan. He defended the drone attacks， saying they made precision strikes and were kept on a “tight leash1”.
美白效果好>mylf什么意思What are drones ud for and how are they controlled？
To the military， they are UAVs （Unmanned Aerial Vehicles） or RPAS （Remotely Piloted Aerial Systems）. However， they are more commonly known as drones.
necessityDrones are ud in situations where manned flight is considered too risky or difficult. They provide troops with a 24-hour “eye in the sky”， ven days a week. Each aircraft can stay aloft2 for up to 17 hours at a time， loitering3 over an area and nding back real-time imagery of activities on the ground.
Tho ud by the United States Air Force and Royal Air Force range from small intelligence， surveillance and reconnaissance craft， some light enough to be launched bjia yuan
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油泵工作原理y hand， to medium-sized armed drones and large spy planes.
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