In chapter 4, the author establishes the handling cost model for respective vessel first to define the standard of vessel handling cost. This model belongs to the realm of absolute cost control.
在第四章成本控制中，首先引入单船装卸成本模型，以确定单船成本标准，属于绝对控制的范畴。
The solar energy and the heat pump water heater equipment, does not need the value to defend, movement absolute safety, moreover the completely automatic control, may save the personnel cost.
太阳能和热泵热水器设备，节电，运行绝对安全，而且运行费用低，可节省人员成本。
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