• 1. mechanical work typical: 机械工作典型 | 典型机械工作

• 1.A discussion is made of the work done by static frictional force and the conservation of mechanical energy in the work doing process by way of typical cases.
  本文就静摩擦力做功以及在静摩擦力做功过程中机械能守恒问题，结合实例做进一步讨论。
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