植物的必须矿质元素有几种?举例说明.
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![植物的必须矿质元素有几种?举例说明.](/uploads/image/z/4874811-51-1.jpg?t=%E6%A4%8D%E7%89%A9%E7%9A%84%E5%BF%85%E9%A1%BB%E7%9F%BF%E8%B4%A8%E5%85%83%E7%B4%A0%E6%9C%89%E5%87%A0%E7%A7%8D%3F%E4%B8%BE%E4%BE%8B%E8%AF%B4%E6%98%8E.)
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