问题
选择题
| —No student ______ to eat snacks in our school. —But still there are some students breaking the rules. |
A. allowed B. is allowed C. should be allowed to D. should allowed |
答案
答案：B
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bB(g)达到平衡后，保持温度不变，将容器体积缩小一半，当达到新平衡时，B的浓度是原来的1.6倍，则（ ）