关于固氮生物的正确说法是 A固氮生物都是异养的 b固氮生物都是共生的 C固氮生物都是细菌或放线菌 D根瘤菌固定的氮素占生物固氮的绝大 Template




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tomski关于固氮生物的正确说法是 a固氮生物都是异养的 b固氮生物都是共生的 coloring