According the structure characteristics of oil filling pipe, combining production experience, designed expanding and necking die.
针对加油管的结构特点，结合企业生产经验，给出了连续扩。
According the structure characteristics of oil filling pipe, combining production experience, designed expanding and necking die.
针对加油管的结构特点，结合企业生产经验，给出了连续扩。
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