问题
选择题
More and more heart patients are surviving thanks to improved surgical _______. [ ]
A. techniques
B. skills
C. abilities
D. system
答案
答案：A
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More and more heart patients are surviving thanks to improved surgical _______. [ ]
A. techniques
B. skills
C. abilities
D. system
答案：A
在一定温度下，2L密闭容器内，反应2NO（g）+O2（g）⇌2NO2（g）体系中，n（NO）随时间的变化如下表：
| 时间/min | 0 | 1 | 2 | 3 | 4 | 5 |
| n（NO）/mol | 0.020 | 0.010 | 0.008 | 0.007 | 0.007 | 0.007 |
A．3 min
B．1 min
C．2 min
D．0 min