Portable MP3 player generally adopts the nonvolatile storage chip to make the memory at present, the capacity is small, the unit has high costs, and does not adapt to play for a long time.
目前便携式MP3播放器一般采用非易失性存储芯片作存储器，容量小、单位成本高，且不适应长时间播放。
Screw compression refrigeration unit is one kind of large scale compression refrigerator with characteristics of big refrigeration capacity, small floor area and high efficiency.
螺杆压缩制冷机是一种制冷能力大、占地面积小、效率高的大型制冷机。
With the single unit capacity of small and medium hydropower growing increasingly and the complex of unit structure, so it put forward a higher demand about unit maintenance.
随着中小型水电机组的单机容量不断增加，机组结构日趋复杂，对机组的检修提出了更高的要求。
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