问题
选择题
Our team ________ their team in the match, that is, our team ________ the match.[ ]
A. won; won
B. defeated; defeated
C. defeated; won
D. won; defeated
答案
答案：C
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Our team ________ their team in the match, that is, our team ________ the match.[ ]
A. won; won
B. defeated; defeated
C. defeated; won
D. won; defeated
答案：C
在一个密闭的容器中有A、B、C、D四种质，在一定条件下（有催化剂）充分反应，测得反应前后各物质的质量如下：
| 物质 | A | B | C | D |
| 反应前质量/g | 1 | 27 | 4 | 9 |
| 反应后质量/g | X | 2 | 20 | 9 |
（2）此反应的基本类型为______；
（3）参加反应的物质的总质量为______g；
（4）X的值为______．