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【简答题】A. prepared for B.is bound to C. stand up for D. in favor of E.speculate about F.in the company of G.in the form of H.are liable to I. invested... with J. in succession One day they passed more than 2...
【简答题】动能为0.87MeV的质子接近静止的汞核（Z=80），当散射角θ=π/2时，它们之间的最小距离是多少？
【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...
A.
6
B.
7
C.
8
D.
10
【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...
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