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。
2
Within the effective mass approximation and the perturbation method, the electron and hole ground-state energy in a magnetic field in the rectangular quantum wire are calculated.
在有效质量近似下，利用微扰理论研究了矩形量子线中电子和空穴的基态能量。
3
Can you get a rectangular cube into a square hole?