[名词解释] 结瘤nodulation

豆血红蛋白leghaemoglobin 竞争结瘤competitivenodulation 振动放矿实现放矿是依靠重力场、（）。 ["磁力场","振动场","电磁场","地球引力"] 镧系元素共有（）种。 ["13","14","15","16"] 类菌体 bacteroid 结瘤nodulation