热能与耕田、碾米、磨粉、划船的动力,是人类所必需的。古代靠人作动力。因为奴隶主只把人的能力视为劳力,剥夺了人的人格,把人和牲畜同等看待,以头计数。一般的人力,象马达一样其出力为1/12马力。在步行时,出力为1/8马力左右。此外,瞬时出力还要大些,100米短距离竞走时,可达0.6马力以上,负重步行时为0.4马力左右。但这样的作业不 Heat and farming, milling, milling, boating motivation, is a human need. Ancient people rely on power. Because the slave-master only treats man’s abilities as labor, deprives people of his personality, treats them equally with animals, and counts them by their heads. General manpower, like a motor, its output is 1/12 horsepower. When walking, the output is about 1/8 horsepower. In addition, the instantaneous output even larger, 100 meters short walk, up to 0.6 horsepower, weight when walking is about 0.4 horsepower. But such a job is not