下列关于氮循环的有关叙述正确的是 A根瘤菌是一类自养需氧型细菌b硝化细菌可以使氮元素回归大气c圆褐固氮菌固定的氮可以被植物吸收 Template




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tomski下列关于氮循环的有关叙述正确的是 a根瘤菌是一类自养需氧型细菌b硝化细菌可以使氮元素回归大气c圆褐固氮菌固定的氮可以被植物吸收 coloring