问题
选择题
Between classes, students usually have _______ break. [ ]
A. ten minute's
B. a ten minutes'
C. a ten-minute
D. ten-minute's
答案
答案：C
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Between classes, students usually have _______ break. [ ]
A. ten minute's
B. a ten minutes'
C. a ten-minute
D. ten-minute's
答案：C
3 C(g)达到平衡时，测得c(A)＝0.5 mol/L。在温度不变的情况下，将容器体积增大一倍，当达到新的平衡时，测得c(A)＝0.20mol/L。下列判断中正确的是