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词汇 nnf
释义 nnfBNC²³⁶²¹³⁺¹
基本例句
=nonnutritive synthetic fiber 无营养合成纤维,=northern nurses federation 北方护士联合会
NNF for more than two seasons reduced both winter wheat and summer maize yield significantly.
连续二季和三季不施氮使冬小麦和夏玉米产量都大幅度减产; cnki
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