1如图1所示使用羊角锤拔钉子动力作用在锤柄上a点.请作出拔钉子时所用最小动力f的示意图.2如图2所示f1是作用在抽水机手柄a点处 Template




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tomski1如图1所示使用羊角锤拔钉子动力作用在锤柄上a点.请作出拔钉子时所用最小动力f的示意图.2如图2所示f1是作用在抽水机手柄a点处 coloring