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计算自由度时需要考虑哪些特殊情况 、和。
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机构具有确定运动的条件为。
Man has woefully misused the earth’s natural resources downthrough the ages. This has been done largely through his ignoring 1.__________P
of the consequenses, but in the process he has succeeded in layingwasteful vast expanses of forests and croplands. If our2.__________
extending population is not to suffer from shortages and pollution 3.__________in the future, a great effort must be made to repair some of
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