机械系统用来工作的系统或装置，如汽车或手持式凿岩机，包括其动力源和辅助设备。
A system or device for doing work, as an automobile or a jackhammer, together with its power source and auxiliary equipment.
提出了设计手持式液压凿岩机的目标函数。
A target function for design of hydraulic hand drills is brought forward in this paper.
机械系统：用来工作的系统或装置，如汽车或手持式凿岩机，包括其动力源和辅助设备。
A system or device for doing work, as an automobile or a jackhammer, together with its power source and auxiliary equipment.
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