那机械功怎么样呢？
By heat engine people mean an engine converting heat energy into mechanical work.
热机是指把热能转变为机械功的一种发动机。
A device, such as a saw, used to perform or facilitate manual or mechanical work.
器具，工具：用来进行或促进手工或机械工作的器具，例如锯子。
Holding other license such as mechanical work, welding, pressure vessel, etc is preferred.
持有别的证书如机械、电焊、压力容器证书是优先的。
Holding other license such as mechanical work, welding, pressure vessel, etc is preferred.
持有别的证书如机械、电焊、压力容器证书是优先的。
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