题目内容：
一个农民想用20块长2米、宽1．2米的金属网建一个一面靠墙的长方形鸡窝。为了防止鸡飞出，所建鸡窝的高度不得低于2米，要使鸡窝面积最大，长方形的长和宽的比应是（ ）。
参考答案：
答案解析：
单选题：一个农民想用20块长2米、宽1．2米的金属网建一个一面靠墙的长方形鸡窝。为了防止鸡飞出，所建鸡窝的高度不得低于2米，要使
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