问题
选择题
My homework is _____ done. I'II be right with you. [ ]
A. hour after hour
B. now and then
C. more or less
D. more and more
答案
答案：C
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My homework is _____ done. I'II be right with you. [ ]
A. hour after hour
B. now and then
C. more or less
D. more and more
答案：C
Z(g)的可逆反应，若反应物X的浓度由0.1mol/L降到0.06mol/L需要20s，再由0.06 mol/L降到0.024mol/L需要的反应时间为[ ]