Research and Produce Direct Shear and Drawing Test United Instrument for Geosyntheic
土工合成材料直剪与拉拔联合试验仪的研制
The instrument to draw hyperbola has great significance for teaching and engineering drawing.
绘制双曲线的仪器在教学及工程绘图方面具有实际意义。
The utility model relates to a portable drawing machine, which belongs to the writing or drawing instrument class.
本实用新型涉及了一种轻便绘图机，属于书写或绘图仪器类。
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