1. Strong rectangular frame fixed by screws, an inset hole every25 cm to fix the slotting auger, guard board, bunches of cables and circuit diagram sidekicks, etc.
坚固的用螺丝固定的长方框，每隔25毫米有一个嵌孔，用来固定槽沟、板、缆束及线路图插袋等。
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2. To reproduce or increase the size of a hole by use of a drill, auger or rotary cutting tool.
用钻头，螺钻或旋转切割机在加工或增大孔的大小。
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3. They have many interesting physical properties, such as symmetric band structure, strong temperature dependences of energy gaps, absence of a heavy hole band, and low Auger recombination rates, etc.
