简答题:请在(58)选出最佳答案。

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请在(58)选出最佳答案。
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生物固氮的过程是将大气中的N2转化为(  )

生物固氮的过程是将大气中的N2转化为(  ) A.NO3- B.N20 C.NH3 D.N02

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下列属于能量型指标的是( )。

下列属于能量型指标的是( )。A.BIAS B.PSY C.人气指标AR D.买卖意愿指标BR

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Section CDirections: in this section, you will hear a passag

Section CDirections: in this section, you will hear a passage three times. When

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Passage ThreeQuestions are based on the passage you have ju

Passage ThreeQuestions are based on the passage you have just heard.A.Its larg

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