The wall thickness of thick wall copper tube drawn without plug is calculated by using Zhou-Zhou formula.
本文用双周数表计算了铜合金厚壁管空拔后的壁厚。
One day, she took a plug and said to her son, " Look, there are two pieces of copper, so it must be plugged in a place where there are two holes."
一天，她拿着一个插头对儿子说：“看，这里有两个铜片，那它一定要插在有两个孔的地方。 你说它应该插在哪儿呢？”
One day, she took a plug and said to her son, " Look, there are two pieces of copper, so it must be plugged in a place where there are two holes."
她的儿子只有三岁。 一天，她拿着一个插头对儿子说：“看，这里有两个铜片，那它一定要插在有两个孔的地方。
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