生物固氮(biological nitrogen fixation)
生物固氮(biological nitrogen fixation)
生物固氮(biological nitrogen fixation)
Roots have the ability to ______.
A.make proteins
B.obtain fresh air
C.produce inorganic nitrogen
D.carry out activities without energy
Tiny drops of weak sulfuric and nitric acids are formed when .
A. sulfur oxides and nitrogen oxides react with each other
B. fossil fuels are burned in the open air
C. sulfur oxides and nitrogen oxides react with the water vapor and oxygen in the atmosphere
D. sulfur dioxide and nitrogen dioxide combine with each other in lakes or ponds
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