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压力挤孔
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压力挤孔
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穿孔
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press piercing
压力挤孔
将方形或多边形钢锭放在挤压缸中,用压力机驱动带有冲头的挤压杆,将管坯挤成中空杯体的工艺过程。
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Spring's Seedling
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Springtime Can't be Locked up
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Spring Vistas From the Brocade Valley
spring warmth
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sprinker irrigation
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sprinkler head
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sprinkler irrigation
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