单选题:生物固氮的过程是将大气中的N2转化为( ) 题目分类:生态学基础 题目类型:单选题 号外号外:注册会员即送体验阅读点! 题目内容: 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 参考答案: 答案解析:
Section CDirections: in this section, you will hear a passag Section CDirections: in this section, you will hear a passage three times. When 分类:生态学基础 题型:单选题 查看答案
Passage ThreeQuestions are based on the passage you have ju Passage ThreeQuestions are based on the passage you have just heard.A.Its larg 分类:生态学基础 题型:单选题 查看答案