问题
选择题
—_________ does the rain come from? —It comes from the clouds.[ ]
A. Where
B. What
C. When
答案
答案：A
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—_________ does the rain come from? —It comes from the clouds.[ ]
A. Where
B. What
C. When
答案：A
xC(g)＋2D(g)，经5min后，测得D的浓度为0.5mol·L－1，c(A)︰c(B)=3:5，C的平均反应速率是0.1m0L／(L·min)