如下图是自然界中氮循环示意图据图回答 1大气中的氮主要通过 进入生物群落其次通过 等途径也可�量供给植物氮素 Template




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tomski如下图是自然界中氮循环示意图据图回答 1大气中的氮主要通过 进入生物群落其次通过 coloring