【单选题】Nitrogen fixation is carried out by a highly reduced form of dinitrogenase and requires ____ electrons: six for the reduction of N 2 and two to produce one molecule of H 2 . Production of H 2 is an ob...
【简答题】Fill in the blanks with the expressions given below. Each expression can be used only once. Just write the letter that represents the expression.( 只写字母代号即可 ) A. prepared for B. is bound to C. stand u...