The article compares the accuracy among three mathematical models for calculating the change of W. t during sinkdrawing and explains the method of assessing models accuracy.
比较了三个计算空拔管壁厚变化数学模型的精度，阐述了评定模型精度的方法。
2
In dawns to come, Mars and Jupiter will continue to rise while Venus and Mercury sink toward the horizon, drawing closer to the rising Sun.
随着黎明的到来，火星和木星将继续上升，而金星和水星则落向地平线，向着升起的太阳靠近。
3
Introduced here in the article are the newly developed sink-drawing technology for making tube for motor rear-view mirror support, covering the shaping method and manufacturing process.