将下列公式化成与之等值的公式,使其没有既是约束出现的,又是自由出现的个体变项:
- 离散数学(02324) - 专业知识收录平台">
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Energy sources may initially be divided into two kinds: non-renewable and renewable. The former group includes coal, oil, gas and, in the long run, nuclear; the latter waterpower, solar power and wind power. The energy from all these sources ultim