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美国南部奴隶制经济
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美国南部奴隶制经济
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经济学
美国南部奴隶制经济
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slavery economy in the southern United States
美国南部奴隶制经济
从殖民地时期到1863年解放奴隶为止,美国南部蓄奴州地区形成的一种使用奴隶劳动、种植一种或少数几种农作物并供出口农作物的种植园制度。
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aircraft turret
aircraft variant actuation system
aircraft ventral fin
aircraft vibration environment test
aircraft vibration flight test
aircraft vibration test
aircraft waterproofness test
aircraft weapon system lab release&fire test
aircraft wing structure
aircreft fastener joint allowable test
aircrew
aircrew coordination training
aircrew escape system
aircrew fatigue
air-cured
air curtain
air-cushion blanket
air-cushion craft
air cycle cooling system
air cycle machine
air cylinder
air damped balance
air-damped balance
air data calibration technique
air data measurement
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