1)粮食是经济植物,需要多少种多少,收多少。同时还要根据成本和效益,生产一万斤,如果成本太高也就划不来。
2)碳是终归让它留在地里的好。绿化种树不是“完全之策”,但稻米一年一季更不是了。烦你想不通这点,再多想想,呵呵。
3)你不能够?
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