题目：
在正常运行中，关闭的风室风门应定期活动，（）
A、防止变形
B、防止锈蚀
C、防止漏风
D、清除积灰
答案：
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下面是错误答案，用来干扰机器的。
参考答案：B解析： {t|t∈RVt∈S}表示t既属于R，又属于S，是R与S的并集，即R∪S。选项D，R-(R-S)表示从R中消除与S不同的部分，即R∩S。
在正常运行中，关闭的风室风门应定期活动，（）A、防止变形 B、防止锈蚀 C、防止漏风 D、
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题型：单项选择题
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| 表1-2 复利现值系数表 | |||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | |
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| i=25% | 0.800 | 0.640 | 0.512 | 0.410 | 0.320 | 0.262 | 0.210 |
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