问题
选择题
When I got home last night, I was frightened to find that in front of my door_____ . [ ]
A. was seated a large dog
B. sat a large dog
C. was a large dog seated
D. did a large dog sit
答案
答案：B
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，达到平衡时体积变为1.3L。这时NO2的转化率为（）。