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按运动副相对运动形式、、和。

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计算自由度时需要考虑哪些特殊情况、和。

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.__________