生物固氮的意义在于 A是氮循环的必经途径 B是植物体内氮素的唯一来源 C是植物体内氮素的主要来源 D是维持氮循环的主要因素——青 Template




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tomski生物固氮的意义在于 a是氮循环的必经途径 b是植物体内氮素的唯一来源 coloring