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conversion of degraded farmland into grassland
退耕还草
中国实行的无偿给予农民粮食和补助,让其不再在坡耕地上种植粮食而改为种草,以防治坡耕地严重水土流失的措施。
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electric centralized interlocking system
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electric chick brooder
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electric circuit foundation
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electric compression heat pump
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electric conductance
electric conducting material
electric conductivity of charged Brownian particle system
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electric conductivity of fiber
electric control microwave device
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electric current focused logging device
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electric curtain of standing wave
electric curtain of travelling wave
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