In this paper, the characteristics of Roller Skating in itself to study the cardiopulmonary function of Roller Skating For primary school students, as well as the impact of body shape.
本文就轮滑运动的本身的特点来研究轮滑运动对于小学生心肺功能以及身体形态的影响。
Core of large roller cold upsetting die made of ld steel has more ideal hardness, strength, anti wear capacity and impact toughness.
采用LD钢制造大型滚子冷镦模具的模芯，具有较理想的硬度、强度、耐磨性和冲击韧性。
The effective methods that increases resistance to multicycle impact for roller are to ensure that the roller has sufficient strength and plasticity and to adopt suitable shaped technics.
因此，保证滚子零件具有足够的强度与塑性，并采用合理的成形工艺，是提高滚子零件多冲抗力的有效方法。
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