作者aaaaaakoyasu (六点半天色还没亮)
看板GMAT
标题[计量] PP1-PS
时间Tue Nov 4 12:38:44 2008
The rate of a certain chemical reaction is directly proportional to the
square of the concentration of chemical A present and inversely proportional
to the concentration of chemical B present. If the concentration of chemical
B is increased by 100 percent, which of the following is closest to the
percent change in the concentration of chemical A required to keep the
reaction rate unchanged?
(A) 100% decrease
(B) 50% decrease
(C) 40% decrease
(D) 40% increase
(E) 50% increase
题目看没有很懂...拜托了<(_ _)>
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