多项选择题
It was after he got what he had desired he realized it ...
单项选择题It was after he got what he had desired he realized it was not so important.
厌氧氨氧化作用的电子受体是（ ）。 A、硝酸盐氮 B、亚硝酸盐氮 C、氨氮 D、有机物
单项选择题厌氧氨氧化作用的电子受体是（ ）。 A、硝酸盐氮 B、亚硝酸盐氮 C、氨氮 D、有机物
The park is to a city the lung is to man′s body.A.asB.t...
单项选择题The park is to a city the lung is to man′s body.
