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问题：
[单选题]必需营养元素是指（ ）
A、在作物体内含量较高而且非常重要的营养元素
B、在作物体内所起作用完全不能被其它营养元素所替代的营养元素
C、能够使某些特有缺素症消失的一类营养元素
D、作物经常吸收利用的营养元素
参考答案：
D
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