胶辊低硬度必须以高弹性为前提，才能提高胶辊瞬时动态圆整度，延长抗弹性疲劳时限，达到稳定、提高纺纱质量的目的。
High elasticity is the premise of low hardness for top roller, it can improve instantaneous dynamic circularity, extend the time of the elasticity fatigue resistance, improve yarn forming quality.
资料综合就导致民航飞行人员飞行疲劳的相关问题进行讨论，并在此基础上提出民航飞行人员的飞行时限与休息制度的原则。
Literature synthesis the relative factors on flight fatigue are discussed, based on which, the principles for duty limitations and rest requirements are put forward.
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