当反应 A2 + B2 = 2B 的速率方程为 υ=k [A2][2] 时,可以得出结论:此反应
A. 一定是基元反应
B. 一定是非基元反应
C. 无法肯定是否为基元反应
D. 对A来说是零级反应
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对于一个确定的化学反应来说,下列说法中正确的是
A. ΔrHmΘ越负,反应速率越快
B. ΔrGmΘ 越负,反应速率越快
C. 活化能越大,反应速率越快
D. 活化能越小,反应速率越快
Their government said that they had to use force to maintain social stability, but manypeoplethat it wouldn'tstability and harmony.
A. contradicted them by saying, make
B. countered by saying, make for
C. opposed by saying, make up
D. objected by saying, result to
We still ________ many advanced countries in environmental protection, but todaywe face a wonderful opportunity to address this problem, and we must not let the_______opportunity.
A.lag behind, slip by
B. have lagged after, slip away
C. have left behind, slide by
D. have been lagged behind, slip off
The professor knew that some students are given to over-quoting in their paper, but onestudent_______. He simply downloaded a whole essay from the Website as his own.This was_______ the professor.
A. went too far away, too much with
B. went far, too much to
C. went too extreme, too much of
D.went too far, too much for