问题
选择题
词语释义。
The girl often keeps an eye on her sick grandmother at home on weekends. [ ]
A. looks for
B. looks after
C. take care
D. plays with
答案
答案：B
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词语释义。
The girl often keeps an eye on her sick grandmother at home on weekends. [ ]
A. looks for
B. looks after
C. take care
D. plays with
答案：B
2Q（g）＋nR（g），达到平衡后，容器内的压强比原来增加5%，X浓度减小
，则该反应方程式中的n值是（ ）