短語(yǔ)詞組短語(yǔ)biological l nitrogen fixation 生物固氮biological removal nitrogen 生物脫氮biological l nitrogen 生物氮biological ammonium nitrogen removal 生物脫氮biological fixation nitrogen 生物固氮作用biological removal nitrogen and phosphorus 生物脫氮除磷biological nitrogen fixation [土壤]生物固氮;生物固氮作用;有生命的物質(zhì)固氮aerobic biological nitrogen removal 好氧生物脫氮biological nitrogen removal 生;生物脫氮 返回 biological nitrogen