Jennifer Tapper almost lost her one-year-old baby Jack after he swallowed a small piece contained in this train toy. 珍尼弗·塔伯几乎因此失去了她1岁的婴儿杰克。杰克吞下了玩具火车上的一个小配件。
Skill of Machining Tapper Based on NC Low-Speed WEDM 数控低速走丝电火花线切割机床加工锥度的技巧
In terms of titanium alloy rheology law, the vibration extruded tapping technological features were analysed and one kind of vibration extruded tapper principle was offered. 从钛合金金属流变规律角度分析了振动挤压攻丝的工艺特点,给出了一种振动挤压攻丝机的原理。