Since precise mechanical tolerance is difficult to maintain over a long shaft, pulling with a cable may be necessary.
因为过长的拉杆很难保证精确的机械误差，故可以用缆索。
The reliability formula of mechanical parts with cracks was derived using the damage tolerance design method, and the reliability of a pressure vessel was studied with samples.
采用损伤容限设计的方法，推导出含裂纹机械零部件的可靠度计算公式，并通过实例研究了某压力容器的可靠度。
Drawing the mechanical engineering drawing usually need to mark the dimension tolerance of the parts.
绘制机械工程图经常要标注零件的尺寸公差。
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